From b92460484f1eb4c84b5c7f43278d611de3fe43e7 Mon Sep 17 00:00:00 2001
From: Yoshiya Hinosawa <stibium121@gmail.com>
Date: Mon, 23 Jul 2018 20:57:10 +0900
Subject: [PATCH] chore: update http:// to https://

---
 htdocs/samples/api_axis_label.html              | 2 +-
 htdocs/samples/api_axis_range.html              | 2 +-
 htdocs/samples/api_category.html                | 2 +-
 htdocs/samples/api_data_colors.html             | 2 +-
 htdocs/samples/api_flow.html                    | 2 +-
 htdocs/samples/api_flow_timeseries.html         | 2 +-
 htdocs/samples/api_legend.html                  | 2 +-
 htdocs/samples/api_tooltip_show.html            | 2 +-
 htdocs/samples/api_transform.html               | 2 +-
 htdocs/samples/api_xgrid_lines.html             | 2 +-
 htdocs/samples/api_ygrid_lines.html             | 2 +-
 htdocs/samples/api_zoom.html                    | 2 +-
 htdocs/samples/area_zerobased.html              | 2 +-
 htdocs/samples/axes_padding.html                | 2 +-
 htdocs/samples/axes_range.html                  | 2 +-
 htdocs/samples/axes_x_localtime.html            | 2 +-
 htdocs/samples/axes_x_range_timeseries.html     | 2 +-
 htdocs/samples/axes_x_selection.html            | 2 +-
 htdocs/samples/axes_x_tick_culling.html         | 2 +-
 htdocs/samples/axes_x_tick_fit.html             | 2 +-
 htdocs/samples/axes_x_tick_rotate.html          | 2 +-
 htdocs/samples/axes_x_tick_values.html          | 2 +-
 htdocs/samples/axes_y2.html                     | 2 +-
 htdocs/samples/axes_y_default.html              | 2 +-
 htdocs/samples/bar_zerobased.html               | 2 +-
 htdocs/samples/bindto.html                      | 2 +-
 htdocs/samples/categorized.html                 | 2 +-
 htdocs/samples/chart_area.html                  | 2 +-
 htdocs/samples/chart_area_spline.html           | 2 +-
 htdocs/samples/chart_area_spline_stacked.html   | 2 +-
 htdocs/samples/chart_area_stacked.html          | 2 +-
 htdocs/samples/chart_area_step.html             | 2 +-
 htdocs/samples/chart_area_step_stacked.html     | 2 +-
 htdocs/samples/chart_bar.html                   | 2 +-
 htdocs/samples/chart_bar_max_width.html         | 2 +-
 htdocs/samples/chart_bar_space.html             | 2 +-
 htdocs/samples/chart_bar_stacked.html           | 2 +-
 htdocs/samples/chart_combination.html           | 2 +-
 htdocs/samples/chart_donut.html                 | 2 +-
 htdocs/samples/chart_gauge.html                 | 2 +-
 htdocs/samples/chart_multi_arc_gauge.html       | 2 +-
 htdocs/samples/chart_pie.html                   | 2 +-
 htdocs/samples/chart_pie_sort.html              | 2 +-
 htdocs/samples/chart_scatter.html               | 2 +-
 htdocs/samples/chart_spline.html                | 2 +-
 htdocs/samples/chart_step.html                  | 2 +-
 htdocs/samples/chart_step_category.html         | 2 +-
 htdocs/samples/custom_x_categorized.html        | 2 +-
 htdocs/samples/custom_x_scale.html              | 2 +-
 htdocs/samples/custom_xs_scale.html             | 2 +-
 htdocs/samples/data_columned.html               | 2 +-
 htdocs/samples/data_hide.html                   | 2 +-
 htdocs/samples/data_json.html                   | 2 +-
 htdocs/samples/data_label.html                  | 2 +-
 htdocs/samples/data_label_format.html           | 2 +-
 htdocs/samples/data_load.html                   | 2 +-
 htdocs/samples/data_load_timeseries.html        | 2 +-
 htdocs/samples/data_region.html                 | 2 +-
 htdocs/samples/data_region_timeseries.html      | 2 +-
 htdocs/samples/data_rowed.html                  | 2 +-
 htdocs/samples/data_url.html                    | 2 +-
 htdocs/samples/different_category_datasets.html | 2 +-
 htdocs/samples/domain_y.html                    | 2 +-
 htdocs/samples/element.html                     | 2 +-
 htdocs/samples/emptydata.html                   | 2 +-
 htdocs/samples/grid_focus.html                  | 2 +-
 htdocs/samples/grid_x_lines.html                | 2 +-
 htdocs/samples/grid_x_lines_timeseries.html     | 2 +-
 htdocs/samples/grids.html                       | 2 +-
 htdocs/samples/grids_timeseries.html            | 2 +-
 htdocs/samples/interaction_enabled.html         | 2 +-
 htdocs/samples/legend.html                      | 2 +-
 htdocs/samples/padding.html                     | 2 +-
 htdocs/samples/padding_update.html              | 2 +-
 htdocs/samples/plugin.html                      | 2 +-
 htdocs/samples/point_r.html                     | 2 +-
 htdocs/samples/point_show.html                  | 2 +-
 htdocs/samples/regions.html                     | 2 +-
 htdocs/samples/regions_timeseries.html          | 2 +-
 htdocs/samples/selection.html                   | 2 +-
 htdocs/samples/simple.html                      | 2 +-
 htdocs/samples/subchart.html                    | 2 +-
 htdocs/samples/subchart_onbrush.html            | 2 +-
 htdocs/samples/timeseries.html                  | 2 +-
 htdocs/samples/timeseries_date.html             | 2 +-
 htdocs/samples/timeseries_descendent.html       | 2 +-
 htdocs/samples/timeseries_raw.html              | 2 +-
 htdocs/samples/tooltip_grouped.html             | 2 +-
 htdocs/samples/tooltip_show.html                | 2 +-
 htdocs/samples/zoom.html                        | 2 +-
 htdocs/samples/zoom_category.html               | 2 +-
 htdocs/samples/zoom_onzoom.html                 | 2 +-
 htdocs/samples/zoom_reduction.html              | 6 +++---
 93 files changed, 95 insertions(+), 95 deletions(-)

diff --git a/htdocs/samples/api_axis_label.html b/htdocs/samples/api_axis_label.html
index db45860..c42e9eb 100644
--- a/htdocs/samples/api_axis_label.html
+++ b/htdocs/samples/api_axis_label.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/api_axis_range.html b/htdocs/samples/api_axis_range.html
index 0d931c4..162c6c5 100644
--- a/htdocs/samples/api_axis_range.html
+++ b/htdocs/samples/api_axis_range.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/api_category.html b/htdocs/samples/api_category.html
index 71d4584..f69beb9 100644
--- a/htdocs/samples/api_category.html
+++ b/htdocs/samples/api_category.html
@@ -6,7 +6,7 @@
     <div id="chart"></div>
     <div id="message"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/api_data_colors.html b/htdocs/samples/api_data_colors.html
index 3761446..bbfc935 100644
--- a/htdocs/samples/api_data_colors.html
+++ b/htdocs/samples/api_data_colors.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/api_flow.html b/htdocs/samples/api_flow.html
index a39386c..e73086a 100644
--- a/htdocs/samples/api_flow.html
+++ b/htdocs/samples/api_flow.html
@@ -11,7 +11,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/api_flow_timeseries.html b/htdocs/samples/api_flow_timeseries.html
index 3b4c9a9..cb568b4 100644
--- a/htdocs/samples/api_flow_timeseries.html
+++ b/htdocs/samples/api_flow_timeseries.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/api_legend.html b/htdocs/samples/api_legend.html
index 005faf2..ca927c3 100644
--- a/htdocs/samples/api_legend.html
+++ b/htdocs/samples/api_legend.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/api_tooltip_show.html b/htdocs/samples/api_tooltip_show.html
index afed345..6dfc05a 100644
--- a/htdocs/samples/api_tooltip_show.html
+++ b/htdocs/samples/api_tooltip_show.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/api_transform.html b/htdocs/samples/api_transform.html
index b9d7175..40b5f89 100644
--- a/htdocs/samples/api_transform.html
+++ b/htdocs/samples/api_transform.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/api_xgrid_lines.html b/htdocs/samples/api_xgrid_lines.html
index 37fc508..0b5f376 100644
--- a/htdocs/samples/api_xgrid_lines.html
+++ b/htdocs/samples/api_xgrid_lines.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/api_ygrid_lines.html b/htdocs/samples/api_ygrid_lines.html
index 69219ea..0890098 100644
--- a/htdocs/samples/api_ygrid_lines.html
+++ b/htdocs/samples/api_ygrid_lines.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/api_zoom.html b/htdocs/samples/api_zoom.html
index 0c659dc..4733964 100644
--- a/htdocs/samples/api_zoom.html
+++ b/htdocs/samples/api_zoom.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/area_zerobased.html b/htdocs/samples/area_zerobased.html
index 781ca0c..96ec556 100644
--- a/htdocs/samples/area_zerobased.html
+++ b/htdocs/samples/area_zerobased.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/axes_padding.html b/htdocs/samples/axes_padding.html
index a750b69..337603b 100644
--- a/htdocs/samples/axes_padding.html
+++ b/htdocs/samples/axes_padding.html
@@ -6,7 +6,7 @@
     <div id="chart1"></div>
     <div id="chart2"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/axes_range.html b/htdocs/samples/axes_range.html
index 9342064..f4183ed 100644
--- a/htdocs/samples/axes_range.html
+++ b/htdocs/samples/axes_range.html
@@ -6,7 +6,7 @@
     <div id="chart1"></div>
     <div id="chart2"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/axes_x_localtime.html b/htdocs/samples/axes_x_localtime.html
index c952d58..293aa7a 100644
--- a/htdocs/samples/axes_x_localtime.html
+++ b/htdocs/samples/axes_x_localtime.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/axes_x_range_timeseries.html b/htdocs/samples/axes_x_range_timeseries.html
index 77c8e39..441c708 100644
--- a/htdocs/samples/axes_x_range_timeseries.html
+++ b/htdocs/samples/axes_x_range_timeseries.html
@@ -6,7 +6,7 @@
     <div id="chart1"></div>
     <div id="chart2"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/axes_x_selection.html b/htdocs/samples/axes_x_selection.html
index 65ec840..849f83b 100644
--- a/htdocs/samples/axes_x_selection.html
+++ b/htdocs/samples/axes_x_selection.html
@@ -7,7 +7,7 @@
     <div id="chart2"></div>
     <div id="chart3"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/axes_x_tick_culling.html b/htdocs/samples/axes_x_tick_culling.html
index 42404c0..1321bae 100644
--- a/htdocs/samples/axes_x_tick_culling.html
+++ b/htdocs/samples/axes_x_tick_culling.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/axes_x_tick_fit.html b/htdocs/samples/axes_x_tick_fit.html
index 5a963b3..fb1962b 100644
--- a/htdocs/samples/axes_x_tick_fit.html
+++ b/htdocs/samples/axes_x_tick_fit.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/axes_x_tick_rotate.html b/htdocs/samples/axes_x_tick_rotate.html
index f53e859..1833de5 100644
--- a/htdocs/samples/axes_x_tick_rotate.html
+++ b/htdocs/samples/axes_x_tick_rotate.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/axes_x_tick_values.html b/htdocs/samples/axes_x_tick_values.html
index b6d3de8..fffd341 100644
--- a/htdocs/samples/axes_x_tick_values.html
+++ b/htdocs/samples/axes_x_tick_values.html
@@ -6,7 +6,7 @@
     <div id="chart1"></div>
     <div id="chart2"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/axes_y2.html b/htdocs/samples/axes_y2.html
index 4c47d41..90c9429 100644
--- a/htdocs/samples/axes_y2.html
+++ b/htdocs/samples/axes_y2.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/axes_y_default.html b/htdocs/samples/axes_y_default.html
index bdfbf8c..1fd898f 100644
--- a/htdocs/samples/axes_y_default.html
+++ b/htdocs/samples/axes_y_default.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/bar_zerobased.html b/htdocs/samples/bar_zerobased.html
index 25f9b3a..c9c1f12 100644
--- a/htdocs/samples/bar_zerobased.html
+++ b/htdocs/samples/bar_zerobased.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/bindto.html b/htdocs/samples/bindto.html
index 776746f..ea004c6 100644
--- a/htdocs/samples/bindto.html
+++ b/htdocs/samples/bindto.html
@@ -7,7 +7,7 @@
     <div class="chart2" style="height:150px;"></div>
     <div class="chart3" style="height:150px;"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart1 = c3.generate({
diff --git a/htdocs/samples/categorized.html b/htdocs/samples/categorized.html
index 77b7ace..cc7e583 100644
--- a/htdocs/samples/categorized.html
+++ b/htdocs/samples/categorized.html
@@ -6,7 +6,7 @@
     <div id="chart1"></div>
     <div id="chart2"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/chart_area.html b/htdocs/samples/chart_area.html
index 216153c..84e6ab8 100644
--- a/htdocs/samples/chart_area.html
+++ b/htdocs/samples/chart_area.html
@@ -14,7 +14,7 @@
     <h3>+/- vaulues</h3>
     <div id="chart5"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/chart_area_spline.html b/htdocs/samples/chart_area_spline.html
index a227b4e..6e9931a 100644
--- a/htdocs/samples/chart_area_spline.html
+++ b/htdocs/samples/chart_area_spline.html
@@ -7,7 +7,7 @@
     <div id="chart2"></div>
     <div id="chart3"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/chart_area_spline_stacked.html b/htdocs/samples/chart_area_spline_stacked.html
index 287ebe9..4395881 100644
--- a/htdocs/samples/chart_area_spline_stacked.html
+++ b/htdocs/samples/chart_area_spline_stacked.html
@@ -7,7 +7,7 @@
     <div id="chart2"></div>
     <div id="chart3"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/chart_area_stacked.html b/htdocs/samples/chart_area_stacked.html
index bc20c86..dfdb9c5 100644
--- a/htdocs/samples/chart_area_stacked.html
+++ b/htdocs/samples/chart_area_stacked.html
@@ -7,7 +7,7 @@
     <div id="chart2"></div>
     <div id="chart3"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/chart_area_step.html b/htdocs/samples/chart_area_step.html
index 60f245e..7356500 100644
--- a/htdocs/samples/chart_area_step.html
+++ b/htdocs/samples/chart_area_step.html
@@ -7,7 +7,7 @@
     <div id="chart2"></div>
     <div id="chart3"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/chart_area_step_stacked.html b/htdocs/samples/chart_area_step_stacked.html
index a497dc1..0f0d42f 100644
--- a/htdocs/samples/chart_area_step_stacked.html
+++ b/htdocs/samples/chart_area_step_stacked.html
@@ -7,7 +7,7 @@
     <div id="chart2"></div>
     <div id="chart3"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/chart_bar.html b/htdocs/samples/chart_bar.html
index 101ffdf..a5465cc 100644
--- a/htdocs/samples/chart_bar.html
+++ b/htdocs/samples/chart_bar.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/chart_bar_max_width.html b/htdocs/samples/chart_bar_max_width.html
index 8643d20..9e670f7 100644
--- a/htdocs/samples/chart_bar_max_width.html
+++ b/htdocs/samples/chart_bar_max_width.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/chart_bar_space.html b/htdocs/samples/chart_bar_space.html
index 6a93290..7e7385f 100644
--- a/htdocs/samples/chart_bar_space.html
+++ b/htdocs/samples/chart_bar_space.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/chart_bar_stacked.html b/htdocs/samples/chart_bar_stacked.html
index 35dc0f5..d1a9b9c 100644
--- a/htdocs/samples/chart_bar_stacked.html
+++ b/htdocs/samples/chart_bar_stacked.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/chart_combination.html b/htdocs/samples/chart_combination.html
index 3ebd8bb..801b333 100644
--- a/htdocs/samples/chart_combination.html
+++ b/htdocs/samples/chart_combination.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/chart_donut.html b/htdocs/samples/chart_donut.html
index a1d21ec..e1906d5 100644
--- a/htdocs/samples/chart_donut.html
+++ b/htdocs/samples/chart_donut.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/chart_gauge.html b/htdocs/samples/chart_gauge.html
index 36c67c3..7660df4 100644
--- a/htdocs/samples/chart_gauge.html
+++ b/htdocs/samples/chart_gauge.html
@@ -8,7 +8,7 @@
     <div id="chart2"></div>
     <div id="chart3"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/chart_multi_arc_gauge.html b/htdocs/samples/chart_multi_arc_gauge.html
index 554765e..2febe49 100644
--- a/htdocs/samples/chart_multi_arc_gauge.html
+++ b/htdocs/samples/chart_multi_arc_gauge.html
@@ -4,7 +4,7 @@
   </head>
   <body>
     <div id="chart"></div>
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/chart_pie.html b/htdocs/samples/chart_pie.html
index cc8a2a0..c3a9c03 100644
--- a/htdocs/samples/chart_pie.html
+++ b/htdocs/samples/chart_pie.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/chart_pie_sort.html b/htdocs/samples/chart_pie_sort.html
index 1c90c7f..a01ccab 100644
--- a/htdocs/samples/chart_pie_sort.html
+++ b/htdocs/samples/chart_pie_sort.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/chart_scatter.html b/htdocs/samples/chart_scatter.html
index 81a4b4e..d9bcd43 100644
--- a/htdocs/samples/chart_scatter.html
+++ b/htdocs/samples/chart_scatter.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/chart_spline.html b/htdocs/samples/chart_spline.html
index ab9827b..5c3cf39 100644
--- a/htdocs/samples/chart_spline.html
+++ b/htdocs/samples/chart_spline.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/chart_step.html b/htdocs/samples/chart_step.html
index 9ff229e..66e5ef0 100644
--- a/htdocs/samples/chart_step.html
+++ b/htdocs/samples/chart_step.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/chart_step_category.html b/htdocs/samples/chart_step_category.html
index fa2979c..6942d8d 100644
--- a/htdocs/samples/chart_step_category.html
+++ b/htdocs/samples/chart_step_category.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/custom_x_categorized.html b/htdocs/samples/custom_x_categorized.html
index c16ab44..a0ba59f 100644
--- a/htdocs/samples/custom_x_categorized.html
+++ b/htdocs/samples/custom_x_categorized.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/custom_x_scale.html b/htdocs/samples/custom_x_scale.html
index 8b6c685..58b9128 100644
--- a/htdocs/samples/custom_x_scale.html
+++ b/htdocs/samples/custom_x_scale.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/custom_xs_scale.html b/htdocs/samples/custom_xs_scale.html
index 2036c25..820e00d 100644
--- a/htdocs/samples/custom_xs_scale.html
+++ b/htdocs/samples/custom_xs_scale.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/data_columned.html b/htdocs/samples/data_columned.html
index d8de8af..8ffff9f 100644
--- a/htdocs/samples/data_columned.html
+++ b/htdocs/samples/data_columned.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/data_hide.html b/htdocs/samples/data_hide.html
index c33d6b2..78ed322 100644
--- a/htdocs/samples/data_hide.html
+++ b/htdocs/samples/data_hide.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/data_json.html b/htdocs/samples/data_json.html
index 5bf5e2e..93fdacf 100644
--- a/htdocs/samples/data_json.html
+++ b/htdocs/samples/data_json.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/data_label.html b/htdocs/samples/data_label.html
index 5ac72ea..e70690d 100644
--- a/htdocs/samples/data_label.html
+++ b/htdocs/samples/data_label.html
@@ -15,7 +15,7 @@
     <div id="chart10"></div>
     <div id="chart11"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/data_label_format.html b/htdocs/samples/data_label_format.html
index f38c2dd..6fba3c7 100644
--- a/htdocs/samples/data_label_format.html
+++ b/htdocs/samples/data_label_format.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/data_load.html b/htdocs/samples/data_load.html
index 00823b3..adc65bb 100644
--- a/htdocs/samples/data_load.html
+++ b/htdocs/samples/data_load.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/data_load_timeseries.html b/htdocs/samples/data_load_timeseries.html
index b556176..31a3716 100644
--- a/htdocs/samples/data_load_timeseries.html
+++ b/htdocs/samples/data_load_timeseries.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/data_region.html b/htdocs/samples/data_region.html
index 9372c76..3fb49c6 100644
--- a/htdocs/samples/data_region.html
+++ b/htdocs/samples/data_region.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/data_region_timeseries.html b/htdocs/samples/data_region_timeseries.html
index 6be6fe8..c863a8b 100644
--- a/htdocs/samples/data_region_timeseries.html
+++ b/htdocs/samples/data_region_timeseries.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/data_rowed.html b/htdocs/samples/data_rowed.html
index e58d884..5aaf3ed 100644
--- a/htdocs/samples/data_rowed.html
+++ b/htdocs/samples/data_rowed.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/data_url.html b/htdocs/samples/data_url.html
index 20aaeeb..1319774 100644
--- a/htdocs/samples/data_url.html
+++ b/htdocs/samples/data_url.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/different_category_datasets.html b/htdocs/samples/different_category_datasets.html
index 4c8c276..258a85e 100644
--- a/htdocs/samples/different_category_datasets.html
+++ b/htdocs/samples/different_category_datasets.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/domain_y.html b/htdocs/samples/domain_y.html
index 532fe28..4a2acdb 100644
--- a/htdocs/samples/domain_y.html
+++ b/htdocs/samples/domain_y.html
@@ -10,7 +10,7 @@
     <div id="chart2"></div>
     <div id="chart3"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/element.html b/htdocs/samples/element.html
index 9a475ce..cfc06eb 100644
--- a/htdocs/samples/element.html
+++ b/htdocs/samples/element.html
@@ -7,7 +7,7 @@
     <div id="chart2"></div>
 
     <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/emptydata.html b/htdocs/samples/emptydata.html
index a7a3dcb..9e699bb 100644
--- a/htdocs/samples/emptydata.html
+++ b/htdocs/samples/emptydata.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/grid_focus.html b/htdocs/samples/grid_focus.html
index 8331a87..c2ed802 100644
--- a/htdocs/samples/grid_focus.html
+++ b/htdocs/samples/grid_focus.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart1"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/grid_x_lines.html b/htdocs/samples/grid_x_lines.html
index f95f1e6..e926ca8 100644
--- a/htdocs/samples/grid_x_lines.html
+++ b/htdocs/samples/grid_x_lines.html
@@ -6,7 +6,7 @@
     <div id="chart1"></div>
     <div id="chart2"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/grid_x_lines_timeseries.html b/htdocs/samples/grid_x_lines_timeseries.html
index b639eb9..86f0c50 100644
--- a/htdocs/samples/grid_x_lines_timeseries.html
+++ b/htdocs/samples/grid_x_lines_timeseries.html
@@ -6,7 +6,7 @@
     <div id="chart1"></div>
     <div id="chart2"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/grids.html b/htdocs/samples/grids.html
index aa50169..00b778d 100644
--- a/htdocs/samples/grids.html
+++ b/htdocs/samples/grids.html
@@ -10,7 +10,7 @@
     <div id="chart5"></div>
     <div id="chart6"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/grids_timeseries.html b/htdocs/samples/grids_timeseries.html
index dc1706f..a4bf2c1 100644
--- a/htdocs/samples/grids_timeseries.html
+++ b/htdocs/samples/grids_timeseries.html
@@ -7,7 +7,7 @@
     <div id="chart2"></div>
     <div id="chart3"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/interaction_enabled.html b/htdocs/samples/interaction_enabled.html
index 1a5d521..9b1a831 100644
--- a/htdocs/samples/interaction_enabled.html
+++ b/htdocs/samples/interaction_enabled.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/legend.html b/htdocs/samples/legend.html
index 5b401f7..780d9c3 100644
--- a/htdocs/samples/legend.html
+++ b/htdocs/samples/legend.html
@@ -10,7 +10,7 @@
     <div id="chart5"></div>
     <div id="chart6"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/padding.html b/htdocs/samples/padding.html
index 198138b..9db78cc 100644
--- a/htdocs/samples/padding.html
+++ b/htdocs/samples/padding.html
@@ -21,7 +21,7 @@
     <div id="chart9"></div>
     <div id="chart10"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/padding_update.html b/htdocs/samples/padding_update.html
index 0292f3a..420688f 100644
--- a/htdocs/samples/padding_update.html
+++ b/htdocs/samples/padding_update.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/plugin.html b/htdocs/samples/plugin.html
index 5534add..c8b5494 100644
--- a/htdocs/samples/plugin.html
+++ b/htdocs/samples/plugin.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script src="/js/samples/plugin.js"></script>
     <script>
diff --git a/htdocs/samples/point_r.html b/htdocs/samples/point_r.html
index b06853c..368709e 100644
--- a/htdocs/samples/point_r.html
+++ b/htdocs/samples/point_r.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/point_show.html b/htdocs/samples/point_show.html
index d426cb7..5905146 100644
--- a/htdocs/samples/point_show.html
+++ b/htdocs/samples/point_show.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/regions.html b/htdocs/samples/regions.html
index 691de72..cae1966 100644
--- a/htdocs/samples/regions.html
+++ b/htdocs/samples/regions.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/regions_timeseries.html b/htdocs/samples/regions_timeseries.html
index 39549cf..399242a 100644
--- a/htdocs/samples/regions_timeseries.html
+++ b/htdocs/samples/regions_timeseries.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/selection.html b/htdocs/samples/selection.html
index 2535aaf..8d62040 100644
--- a/htdocs/samples/selection.html
+++ b/htdocs/samples/selection.html
@@ -27,7 +27,7 @@
     grouped => false, multiple => false, tooltip.grouped = false
     <div id="chart4-1"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/simple.html b/htdocs/samples/simple.html
index f6ac441..bcc81b9 100644
--- a/htdocs/samples/simple.html
+++ b/htdocs/samples/simple.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/subchart.html b/htdocs/samples/subchart.html
index a611914..5b64a90 100644
--- a/htdocs/samples/subchart.html
+++ b/htdocs/samples/subchart.html
@@ -7,7 +7,7 @@
     <div id="chart2"></div>
     <div id="chart3"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/subchart_onbrush.html b/htdocs/samples/subchart_onbrush.html
index d5c07d8..b101a47 100644
--- a/htdocs/samples/subchart_onbrush.html
+++ b/htdocs/samples/subchart_onbrush.html
@@ -6,7 +6,7 @@
     <div id="chart1"></div>
     <div id="chart2"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/timeseries.html b/htdocs/samples/timeseries.html
index 9f74698..5a8c29b 100644
--- a/htdocs/samples/timeseries.html
+++ b/htdocs/samples/timeseries.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/timeseries_date.html b/htdocs/samples/timeseries_date.html
index 8875a58..4627c36 100644
--- a/htdocs/samples/timeseries_date.html
+++ b/htdocs/samples/timeseries_date.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/timeseries_descendent.html b/htdocs/samples/timeseries_descendent.html
index ed5a6d8..4f937b5 100644
--- a/htdocs/samples/timeseries_descendent.html
+++ b/htdocs/samples/timeseries_descendent.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/timeseries_raw.html b/htdocs/samples/timeseries_raw.html
index fd4a828..1cf25c2 100644
--- a/htdocs/samples/timeseries_raw.html
+++ b/htdocs/samples/timeseries_raw.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/tooltip_grouped.html b/htdocs/samples/tooltip_grouped.html
index 4a3798b..77134bb 100644
--- a/htdocs/samples/tooltip_grouped.html
+++ b/htdocs/samples/tooltip_grouped.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/tooltip_show.html b/htdocs/samples/tooltip_show.html
index f7714ed..b44bad9 100644
--- a/htdocs/samples/tooltip_show.html
+++ b/htdocs/samples/tooltip_show.html
@@ -5,7 +5,7 @@
   <body>
     <div id="chart"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
       var chart = c3.generate({
diff --git a/htdocs/samples/zoom.html b/htdocs/samples/zoom.html
index c2deb6e..d435642 100644
--- a/htdocs/samples/zoom.html
+++ b/htdocs/samples/zoom.html
@@ -7,7 +7,7 @@
     <button onclick="load()">Load</button>
     <div id="chart2"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/zoom_category.html b/htdocs/samples/zoom_category.html
index 4150a6a..b4b1704 100644
--- a/htdocs/samples/zoom_category.html
+++ b/htdocs/samples/zoom_category.html
@@ -6,7 +6,7 @@
     <div id="chart"></div>
     <button onclick="load()">Load</button>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/zoom_onzoom.html b/htdocs/samples/zoom_onzoom.html
index 06ded95..e290182 100644
--- a/htdocs/samples/zoom_onzoom.html
+++ b/htdocs/samples/zoom_onzoom.html
@@ -6,7 +6,7 @@
     <div id="chart1"></div>
     <div id="chart2"></div>
 
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script>
 
diff --git a/htdocs/samples/zoom_reduction.html b/htdocs/samples/zoom_reduction.html
index a0c359e..41b4a2c 100644
--- a/htdocs/samples/zoom_reduction.html
+++ b/htdocs/samples/zoom_reduction.html
@@ -1,13 +1,13 @@
 <!DOCTYPE html>
-<html xmlns="http://www.w3.org/1999/xhtml">
+<html>
 <head>
     <title>c3ext</title>
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <link rel="shortcut icon" href="/images/logo_128.ico" />
     <link href="/css/c3.css" rel="stylesheet" />
-    <script src="http://code.jquery.com/jquery-2.0.3.min.js"></script>
+    <script src="https://code.jquery.com/jquery-2.0.3.min.js"></script>
     <script src="https://rawgithub.com/brandonaaron/jquery-mousewheel/master/jquery.mousewheel.min.js"></script>
-    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
+    <script src="https://d3js.org/d3.v5.min.js" charset="utf-8"></script>
     <script src="/js/c3.js"></script>
     <script src="/js/extensions/c3ext.js"></script>
     <script src="/js/samples/zoom_reduction.js"></script>