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[GH-ISSUE #992] ERR_HTTP2_PROTOCOL_ERROR #829

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opened 2026-02-26 06:34:35 +03:00 by kerem · 3 comments

kerem commented

2026-02-26 06:34:35 +03:00

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Originally created by @arnaudbagnis on GitHub (Apr 1, 2021).
Original GitHub issue: https://github.com/NginxProxyManager/nginx-proxy-manager/issues/992

ERR_HTTP2_PROTOCOL_ERROR
I can't access my website
how to reproduct :

web application exposed to 5000 port
502 Bad Gateway
*8596 upstream sent too big header while reading response header from upstream
add configuration in avanced configuration
proxy_buffer_size 128k; proxy_buffers 4 256k; proxy_busy_buffers_size 256k;
ERR_HTTP2_PROTOCOL_ERROR
no log for this error

I can access it directly with the ip + port address but not with the proxy domain name

Do you have any ideas to help me ?

Thanks

Originally created by @arnaudbagnis on GitHub (Apr 1, 2021). Original GitHub issue: https://github.com/NginxProxyManager/nginx-proxy-manager/issues/992 ERR_HTTP2_PROTOCOL_ERROR I can't access my website how to reproduct : - web application exposed to 5000 port - 502 Bad Gateway - *8596 upstream sent too big header while reading response header from upstream - add configuration in avanced configuration ` proxy_buffer_size 128k; proxy_buffers 4 256k; proxy_busy_buffers_size 256k;` - ERR_HTTP2_PROTOCOL_ERROR - no log for this error I can access it directly with the ip + port address but not with the proxy domain name Do you have any ideas to help me ? Thanks

kerem

2026-02-26 06:34:35 +03:00

closed this issue
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kerem commented

2026-02-26 06:34:36 +03:00

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@cjamcu commented on GitHub (Sep 10, 2021):

@arnaudbagnis I don't know if you still need it, but try adding this custom config

  location / {

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


    # Proxy!
    include conf.d/include/proxy.conf;
  }

@cjamcu commented on GitHub (Sep 10, 2021): @arnaudbagnis I don't know if you still need it, but try adding this custom config ``` location / { proxy_buffer_size 128k; proxy_buffers 4 256k; proxy_busy_buffers_size 256k; # Proxy! include conf.d/include/proxy.conf; } ```

kerem commented

2026-02-26 06:34:36 +03:00

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@github-actions[bot] commented on GitHub (Mar 15, 2024):

Issue is now considered stale. If you want to keep it open, please comment 👍

@github-actions[bot] commented on GitHub (Mar 15, 2024): Issue is now considered stale. If you want to keep it open, please comment :+1:

kerem commented

2026-02-26 06:34:36 +03:00

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@github-actions[bot] commented on GitHub (Apr 26, 2025):

Issue was closed due to inactivity.

@github-actions[bot] commented on GitHub (Apr 26, 2025): Issue was closed due to inactivity.

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