520 error when proxy is enabled during multipart upload... only if my origin returns a 4xx error
I have a file upload daemon proxied through CF that handles multipart file uploads. It returns 4xx authorization errors for bad headers etc...
- Without proxying it returns 100 continue and uploads
- When proxying with good headers it returns 100 continue and uploads
- When proxying and my origin responds 401 for bad headers, I get a 520 error back in curl
- Without proxying and with bad headers I get the 401 back normally.
Is there maybe some special processing or timeout for multipart uploads at play here?
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