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44 lines
1.5 KiB
44 lines
1.5 KiB
12 years ago
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Adding HTTP Method Overrides
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============================
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Some HTTP proxies do not support arbitrary HTTP methods or newer HTTP
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methods (such as PATCH). In that case it's possible to “proxy” HTTP
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methods through another HTTP method in total violation of the protocol.
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The way this works is by letting the client do an HTTP POST request and
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set the ``X-HTTP-Method-Override`` header and set the value to the
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intended HTTP method (such as ``PATCH``).
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This can easily be accomplished with an HTTP middleware::
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class HTTPMethodOverrideMiddleware(object):
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allowed_methods = frozenset([
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'GET',
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'HEAD',
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'POST',
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'DELETE',
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'PUT',
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'PATCH',
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'OPTIONS'
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])
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bodyless_methods = frozenset(['GET', 'HEAD', 'OPTIONS', 'DELETE'])
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def __init__(self, app):
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self.app = app
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def __call__(self, environ, start_response):
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method = environ.get('HTTP_X_HTTP_METHOD_OVERRIDE', '').upper()
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if method in self.allowed_methods:
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method = method.encode('ascii', 'replace')
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environ['REQUEST_METHOD'] = method
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if method in self.bodyless_methods:
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environ['CONTENT_LENGTH'] = '0'
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return self.app(environ, start_response)
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To use this with Flask this is all that is necessary::
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from flask import Flask
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app = Flask(__name__)
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app.wsgi_app = HTTPMethodOverrideMiddleware(app.wsgi_app)
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