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SyntaxError: Unexpected end of JSON input when creating a merge request #13283
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opened 2025-11-02 10:37:19 -06:00 by GiteaMirror
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Reference: github-starred/gitea#13283
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Originally created by @T-baby on GitHub (Jul 12, 2024).
Description
When trying to create a merge request in a self-hosted Gitea instance, a toast notification pops up with the message: "SyntaxError: Unexpected end of JSON input". After checking the server logs, no errors were found.
Gitea Version
1.22.0
Can you reproduce the bug on the Gitea demo site?
No
Log Gist
No response
Screenshots
No response
Git Version
No response
Operating System
No response
How are you running Gitea?
Docker, version 20.10.17, running on Ubuntu 22.04.
Database
PostgreSQL
@techknowlogick commented on GitHub (Jul 13, 2024):
Thanks for your report, are you able to share details of the developer console in your browser, or network tab showing what the http response shows?
@T-baby commented on GitHub (Jul 15, 2024):
@matrixcloud commented on GitHub (Jul 25, 2024):
same issue, any solution?
@wxiaoguang commented on GitHub (Jul 25, 2024):
There were many similar reports: check your reverse-proxy (eg: nginx) & firewall & WAF, do not "deny" some requests for Gitea's backend.
If there is still a problem, please show your full configuration (including Gitea's app.ini and your reverse-proxy config), and provide a reproducible setup with detailed steps.
@T-baby commented on GitHub (Jul 25, 2024):
No WAF and CDN was used, only Nginx was used for reverse proxy. The Nginx configuration is as follows:
@wxiaoguang commented on GitHub (Jul 25, 2024):
@wxiaoguang commented on GitHub (Jul 25, 2024):
ps: Nginx could have various plugins. , so "please show your full configuration", eg:
nginx -TThe config you shown is not the real one you are using, because I can see you manually prettified / changed it.
@T-baby commented on GitHub (Jul 25, 2024):
This request url is:
https://xx/xx/project/compare/develop...feat/dev_testThis request headers is:
This response headers is:
This response body is null.
The full configuration of nginx:
@wxiaoguang commented on GitHub (Jul 25, 2024):
I think it is still related to your network or config.
@wxiaoguang commented on GitHub (Jul 25, 2024):
Maybe your request is rejected by Tencent Cloud.
@T-baby commented on GitHub (Jul 25, 2024):
I tried using it in the browser's incognito mode, but I still couldn't merge. The complete headers of requests and response are as follows:
We are unable to create a merge request only for this repository. It works fine for all others.
@wxiaoguang commented on GitHub (Jul 25, 2024):
Try go use other servers than Tencent Cloud.
@T-baby commented on GitHub (Jul 25, 2024):
We are not using Tencent Cloud servers.
@wxiaoguang commented on GitHub (Jul 25, 2024):
Then: "please provide a reproducible setup with detailed steps."
@wxiaoguang commented on GitHub (Jul 25, 2024):
You could provide the reproducible setup by a docker-compose file and some related commands, to make others could also reproduce the problem on their side.
@wolfogre commented on GitHub (Aug 16, 2024):
I received another report similar to this issue. And this time it can indeed be found in Gitea's logs that it received the request and returned a response with zero status code.
IIRC, the framework will return 200 with an empty body if
WriteHeaderhasn't been called.No idea how it could happen, but maybe there is something going wrong with Gitea.
@wxiaoguang commented on GitHub (Aug 21, 2024):
More context and a new clue:
https://github.com/go-gitea/gitea/issues/31893#issuecomment-2300630715