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43 lines
1.5 KiB
43 lines
1.5 KiB
Adding HTTP Method Overrides |
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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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