Python Requests image upload HTTP POST

Question

I am having some problem with a POST request that is driving me crazy. I am trying to upload an image using a POST using python requests by replicating the original request

First of all, this is the original request I can see with Firebug that the request header is:

Accept application/json, text/javascript, */*; q=0.01
Accept-Encoding gzip, deflate
Accept-Language en-US,en;q=0.7,it;q=0.3
Cache-Control no-cache
Connection keep-alive
Content-Length 26051
Content-Type multipart/form-data; boundary=--------------------------- 37693668010849786771875799013
Cookie some cookie
DNT 1
Host my.host.com
Pragma no-cache
Referer https://my.host.com/postad/1dc185ff9e814068be23ed674956a190
User-Agent Mozilla/5.0 (X11; Linux i686; rv:38.0) Gecko/20100101 Firefox/38.0
X-Requested-With XMLHttpRequest

and the Body of the POST request:

-----------------------------5697279162042627623887894974
Content-Disposition: form-data; name="image"; filename="clip.jpg"
Content-Type: image/jpeg

ÿØÿà�JFIF������ÿÛ�C�     .....
-----------------------------5697279162042627623887894974
Content-Disposition: form-data; name="upload"


-----------------------------5697279162042627623887894974--

This is the code I am using to upload the image:

files = {'image': ('clip.jpg', open('clip.jpg', 'rb'))}
post_image_url = "https://my.host.com/postad/563a533d9105448dbaf853f7ca0265fa/images"
r = session.post(post_image_url, files=files)

but I always get a 404 error, supposing that the request is not correct. Think I have to adjust the request to reflect the origin request examined with Firebug. I believe the request its not complete, I probably am missing the last part of the request:

-----------------------------5697279162042627623887894974
Content-Disposition: form-data; name="upload"


-----------------------------5697279162042627623887894974--

which I cannot replicate in any way.

Martijn Pieters · Accepted Answer · 2015-05-27 10:43:37Z

1

You can add additional fields with the data argument:

data = {'upload': ''}

r = session.post(post_image_url, files=files, data=data)

This is just the value of the submit button, an empty string in your case.

answered May 27, 2015 at 10:43

Martijn Pieters

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