diff --git a/cmd/web.go b/cmd/web.go
index 57c8f0077..264c08d73 100644
--- a/cmd/web.go
+++ b/cmd/web.go
@@ -247,6 +247,8 @@ func runWeb(ctx *cli.Context) {
 					m.Get("/commits/:commitid", middleware.RepoRef(), v1.CommitByID)
 					m.Get("/commits/head", middleware.RepoRef(), v1.HEADCommit)
 
+					m.Get("/compare/:before([a-z0-9]{40})...:after([a-z0-9]{40})", middleware.RepoRef(), v1.DiffRange)
+
 					m.Group("/releases", func() {
 						m.Combo("").Get(v1.ListReleases).
 							Post(bindIgnErr(api.CreateReleaseOption{}), v1.CreateRelease)
diff --git a/routers/api/v1/repo_commits.go b/routers/api/v1/repo_commits.go
index 9892dce5a..d4dfa1fe1 100644
--- a/routers/api/v1/repo_commits.go
+++ b/routers/api/v1/repo_commits.go
@@ -7,6 +7,7 @@ package v1
 import (
 	api "github.com/gogits/go-gogs-client"
 
+	"github.com/gogits/gogs/models"
 	"github.com/gogits/gogs/modules/git"
 	"github.com/gogits/gogs/modules/log"
 	"github.com/gogits/gogs/modules/middleware"
@@ -24,13 +25,13 @@ func ToApiCommit(commit *git.Commit) *api.Commit {
 	return &api.Commit{
 		ID:                commit.Id.String(),
 		Author:            *ToApiSignature(commit.Author),
-		Committer:        *ToApiSignature(commit.Committer),
-		CommitMessage:  commit.CommitMessage,
+		Committer:         *ToApiSignature(commit.Committer),
+		CommitMessage:     commit.CommitMessage,
 	}
 }
 
 func HEADCommit(ctx *middleware.Context) {
-	ctx.JSON(200, ToApiCommit(ctx.Repo.Commit.Id.String()))
+	ctx.JSON(200, ctx.Repo.Commit.Id.String())
 }
 
 func CommitByID(ctx *middleware.Context) {
@@ -44,4 +45,92 @@ func CommitByID(ctx *middleware.Context) {
 	}
 
 	ctx.JSON(200, ToApiCommit(commit))
+}
+
+
+func ToApiDiff(diff *models.Diff) *api.Diff {
+	return &api.Diff{
+		TotalAddition:        diff.TotalAddition,
+		TotalDeletion:        diff.TotalDeletion,
+		Files:                ToApiDiffFiles(diff.Files),
+	}
+}
+
+func ToApiDiffFiles(diffFiles []*models.DiffFile) []*api.DiffFile {
+	apiDiffFiles := make([]*api.DiffFile, len(diffFiles))
+	for i := range apiDiffFiles {
+		apiDiffFiles[i] = ToApiDiffFile(diffFiles[i])
+	}
+	return apiDiffFiles
+}
+
+func ToApiDiffFile(diffFile *models.DiffFile) *api.DiffFile {
+	return &api.DiffFile{
+		Name:               diffFile.Name,
+		Index:              diffFile.Index,
+		Addition:           diffFile.Addition,
+		Deletion:           diffFile.Deletion,
+		Type:               diffFile.Type,
+		IsCreated:          diffFile.IsCreated,
+		IsDeleted:          diffFile.IsDeleted,
+		IsBin:              diffFile.IsBin,
+		Sections:           ToApiDiffSections(diffFile.Sections),
+	}
+}
+
+func ToApiDiffSections(diffSections []*models.DiffSection) []*api.DiffSection {
+	apiDiffSections := make([]*api.DiffSection, len(diffSections))
+	for i := range apiDiffSections {
+		apiDiffSections[i] = ToApiDiffSection(diffSections[i])
+	}
+	return apiDiffSections
+}
+
+func ToApiDiffSection(diffSection *models.DiffSection) *api.DiffSection {
+	return &api.DiffSection{
+		Name:	diffSection.Name,
+		Lines:	ToApiDiffLines(diffSection.Lines),
+	}
+}
+
+func ToApiDiffLines(diffLines []*models.DiffLine) []*api.DiffLine {
+	apiDiffLines := make([]*api.DiffLine, len(diffLines))
+	for i := range apiDiffLines {
+		apiDiffLines[i] = ToApiDiffLine(diffLines[i])
+	}
+	return apiDiffLines
+}
+
+func ToApiDiffLine(diffLine *models.DiffLine) *api.DiffLine {
+	return &api.DiffLine{
+		LeftIdx:  diffLine.LeftIdx,
+		RightIdx: diffLine.RightIdx,
+		Type:     diffLine.Type,
+		Content:  diffLine.Content,
+	}
+}
+
+func DiffRange(ctx *middleware.Context) {
+	beforeCommitID := ctx.Params(":before")
+	afterCommitID := ctx.Params(":after")
+
+	_, err := ctx.Repo.GitRepo.GetCommit(beforeCommitID)
+	if err != nil {
+		ctx.Handle(404, "GetCommit", err)
+		return
+	}
+	_, err = ctx.Repo.GitRepo.GetCommit(afterCommitID)
+	if err != nil {
+		ctx.Handle(404, "GetCommit", err)
+		return
+	}
+
+	diff, err := models.GetDiffRange(ctx.Repo.GitRepo.Path, beforeCommitID, afterCommitID, 10000)
+	if err != nil {
+		log.Error(4, "GetDiffRange: %v", err)
+		ctx.Error(500, err.Error())
+		return
+	}
+
+	ctx.JSON(200, ToApiDiff(diff))
 }
\ No newline at end of file
diff --git a/routers/api/v1/repo_releases.go b/routers/api/v1/repo_releases.go
index 3af75fcc3..f9d84f766 100644
--- a/routers/api/v1/repo_releases.go
+++ b/routers/api/v1/repo_releases.go
@@ -17,18 +17,18 @@ import (
 func ToApiRelease(release *models.Release, publisher *models.User) *api.Release {
 
 	return &api.Release{
-		ID:          		release.Id,
-		Publisher:			*ToApiUser(publisher),
-		TagName:			release.TagName,
-		LowerTagName:		release.LowerTagName,
-		Target:				release.Target,
-		Title:				release.Title,
-		Sha1:				release.Sha1,
-		NumCommits:			release.NumCommits,
-		Note:				release.Note,
-		IsDraft:			release.IsDraft,
-		IsPrerelease:		release.IsPrerelease,
-		Created:			release.Created,
+		ID:                release.Id,
+		Publisher:            *ToApiUser(publisher),
+		TagName:            release.TagName,
+		LowerTagName:        release.LowerTagName,
+		Target:                release.Target,
+		Title:                release.Title,
+		Sha1:                release.Sha1,
+		NumCommits:            release.NumCommits,
+		Note:                release.Note,
+		IsDraft:            release.IsDraft,
+		IsPrerelease:        release.IsPrerelease,
+		Created:            release.Created,
 	}
 }
 
@@ -42,19 +42,17 @@ func ListReleases(ctx *middleware.Context) {
 
 	apiReleases := make([]*api.Release, len(rels))
 	for i, rel := range rels {
-		if models.IsUserExist(rel.PublisherId, "") {
-			publisher, err := models.GetUserByID(rel.PublisherId)
-			if err != nil {
-				if models.IsErrUserNotExist(err) {
-					publisher = models.NewFakeUser()
-				} else {
-					log.Error(4, "GetUserByID: %v", err)
-					ctx.Status(500)
-					return
-				}
+		publisher, err := models.GetUserByID(rel.PublisherId)
+		if err != nil {
+			if models.IsErrUserNotExist(err) {
+				publisher = models.NewFakeUser()
+			} else {
+				log.Error(4, "GetUserByID: %v", err)
+				ctx.Status(500)
+				return
 			}
-			apiReleases[i] = ToApiRelease(rel, publisher)
 		}
+		apiReleases[i] = ToApiRelease(rel, publisher)
 	}
 	ctx.JSON(200, &apiReleases)
 }