Flask and Transfer-Encoding: chunked

Its not the Flask Python, its the mod_wsgi. Only mod_wsgi versions 3.0+ started to support chunked http transfers. Flask Python internally use Werkzeug tool-kit as an interface to mod_wsgi. If you installed it from the apt sources it may be an old version.

Try compiling the latest version of mod_wsgi and then install the Flask framework, it may solve the problem.

This works for me but its not the most elegant way of shimming chunked parsing. I used the method of sticking the body into the environment of the response.

Get raw POST body in Python Flask regardless of Content-Type header

But added code to deal with chunked parsing

class WSGICopyBody(object):    def __init__(self, application):        self.application = application    def __call__(self, environ, start_response):        from cStringIO import StringIO        input = environ.get('wsgi.input')        length = environ.get('CONTENT_LENGTH', '0')        length = 0 if length == '' else int(length)        body = ''        if length == 0:            environ['body_copy'] = ''            if input is None:                return            if environ.get('HTTP_TRANSFER_ENCODING','0') == 'chunked':                size = int(input.readline(),16)                while size > 0:                    body += input.read(size+2)                    size = int(input.readline(),16)        else:            body = environ['wsgi.input'].read(length)        environ['body_copy'] = body        environ['wsgi.input'] = StringIO(body)        # Call the wrapped application        app_iter = self.application(environ,                                     self._sr_callback(start_response))        # Return modified response        return app_iter    def _sr_callback(self, start_response):        def callback(status, headers, exc_info=None):            # Call upstream start_response            start_response(status, headers, exc_info)        return callbackapp.wsgi_app = WSGICopyBody(app.wsgi_app)

use this to get at it

request.environ['body_copy']