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400 status code for a regular GET request
Seems like I'm facing the same or really similar issue. Just wanted to try Dropbox for my pet-project read-only data storage and found that it always responds with a 400 status code for a regular GET...
Hi Здравко, Greg-DB and sorry for the late response. Today I finally managed to understand the root cause of the issue and found a workaround to it. It is not related to the extra new line I thought earlier, but it is something with the redirect URL received after the first GET request. I was a bit confused by the automatic redirects everywhere so the actual error was tied to the second request. Below are my test scenario, issue description and a workaround.
Test scenario:
1. Send a GET request to this URL: https://www.dropbox.com/scl/fi/fc5rwkff82yvy66ktagv7/test.txt?rlkey=wqzs2qbbfazbgj3ttcaik9pq2&dl=1
2. Receive a 302 Found response with this header: Location: https://ucf3d30d8449d3b4b71630f2179a.dl.dropboxusercontent.com/cd/0/get/CUfGJ4UYzNP3f_SeeyAWDmkzqSHoJk98QNNmD7g4NUoVFnAS6PpVPrCmKLfGBS9_fNsxCkcNG3dT40ygtSc8ceWPxLQYy-NiCrRMDxJ-5u_ZftDOnRmXk-ta_m1czPFq5KRSEvknl3F7pFjk01onJrqL/file?dl=1#
3. Follow the redirect URL and get a 400 Bad Request response. Note: the URL above expires quite early, it'll return the 410 response now, but it is expected and not the actual issue.
Issue and workaround:
The redirect URL contains the # character at the end which causes the 400 response. It is interesting that both curl and Postman remove this character so that is why it is not reproduced there. Removing this character manually before following the redirect fixes the issue and I can get a valid response in my environment as well.
Not sure why this character is a part of the URL and if it is an HTTP rule, Dropbox bug or bug of the underlaying library I'm using, but at least now I have a clean understanding of the issue and a workaround for it. I want to know your thoughts about it and then if it is a library bug, I'll redirect it to its developer 🙂
ЗдравкоI knew that it is usually used to scroll the page to a specific section or highlight some region of interest if a user agent supports it, but did not know that it should never be sent back to server... My conclusion that there is a bug in both Dropbox and the URI specification itself 😁
Imagine you had a link www.abc.com/qwe#asd, then it was moved to www.abc.com/qwert#asdfg and you want to apply a 301 redirect to it. You can't do it with Dropbox, it'll respond with a 400 error. This part is called Fragment, here is the related RFC section https://datatracker.ietf.org/doc/html/rfc3986#section-3.5
Why is it a Dropbox bug? IMHO, it should not send a URI with the number sign character without anything after it, especially for such redirects. Also, I think that this part should be excluded on a server if it has no special meaning there, but it should not respond with the 400 error. Most of the servers (just tried a couple of Google links) can use or exclude it and the request will be processed normally.
MikkBenelis, Yes, I agree that there are lot of bug tolerated services, like you mentioned. The existence of such bug toleration somewhere doesn't change the standard though! It stays the same. 🤷
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