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[GH-ISSUE #438] 502 Bad Gateway due to proxy buffer size #369

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opened 2026-02-26 06:32:34 +03:00 by kerem · 4 comments

kerem commented

2026-02-26 06:32:34 +03:00

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Originally created by @damianog on GitHub (May 30, 2020).
Original GitHub issue: https://github.com/NginxProxyManager/nginx-proxy-manager/issues/438

I am using jc21/nginx-proxy-manager:latest 2.3

During POST action of an asp.net core Blazor application I get 502 error

from /data/logs/error.log I discovered the cause:

...upstream sent too big header while reading response header from upstream...

I found the solution by configuring the Custom Nginx Configuration on "Advanced" tab with the following parameters:

  proxy_buffer_size   128k;
  proxy_buffers   4 256k;
  proxy_busy_buffers_size   256k;

as explained on http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_buffer_size

Please consider to add these parameters by default or make them configurable by panel settings.

Originally created by @damianog on GitHub (May 30, 2020). Original GitHub issue: https://github.com/NginxProxyManager/nginx-proxy-manager/issues/438 I am using `jc21/nginx-proxy-manager:latest` 2.3 During POST action of an asp.net core Blazor application I get 502 error from /data/logs/error.log I discovered the cause: `...upstream sent too big header while reading response header from upstream...` I found the solution by configuring the Custom Nginx Configuration on "Advanced" tab with the following parameters: ``` proxy_buffer_size 128k; proxy_buffers 4 256k; proxy_busy_buffers_size 256k; ``` as explained on http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_buffer_size Please consider to add these parameters by default or make them configurable by panel settings.

kerem

2026-02-26 06:32:34 +03:00

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kerem commented

2026-02-26 06:32:35 +03:00

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@MartinKuhl commented on GitHub (Mar 3, 2021):

@damianog could you post your full entry in the Advanced tab?

@MartinKuhl commented on GitHub (Mar 3, 2021): @damianog could you post your full entry in the Advanced tab?

kerem commented

2026-02-26 06:32:35 +03:00

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@damianog commented on GitHub (Mar 3, 2021):

Hi @MartinKuhl,

cut and paste exactly as I wrote

@damianog commented on GitHub (Mar 3, 2021): Hi @MartinKuhl, cut and paste exactly as I wrote ![image](https://user-images.githubusercontent.com/2786682/109854801-c3912380-7c57-11eb-8f28-79fbf87246b9.png)

kerem commented

2026-02-26 06:32:35 +03:00

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@MartinKuhl commented on GitHub (Mar 4, 2021):

thanks a lot, that fixes my issue too!

@MartinKuhl commented on GitHub (Mar 4, 2021): thanks a lot, that fixes my issue too!

kerem commented

2026-02-26 06:32:35 +03:00

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@douglas1dev commented on GitHub (Oct 21, 2024):

thanks a lot

@douglas1dev commented on GitHub (Oct 21, 2024): thanks a lot

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