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I have a form-data as well as file to be sent in the same POST. For ex, {duration: 2000, file: test.wav}. I saw the many threads here on multipart/form-data posting using python requests. They were useful, especially this one . My sample request is as below: files = {'file': ('wavfile', open(filename, 'rb'))} data = {'duration': duration} headers = {'content-type': 'multipart/form-data'} r = self.session.post(url, files=files, data=data, headers=headers) But when I execute the above code, I get this error: 5:59:55.338 Dbg 09900 [DEBUG] Resolving exception from handler [null]: org.springframework.web.multipart.MultipartException: Could not parse multipart servlet request; nested exception is org.apache.commons.fileupload.FileUploadException: the request was rejected because no multipart boundary was found. So my questions are: 1) How can I see the content of the request being sent? Couldn't use wireshark, its not across the network. 2) why is the boundary missing in the encoded data? Did I miss anything, please point out.

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