nginx/nginx · error

NGX_LOG_ALERT

NGX_LOG_ALERT

Error message

fastcgi request record is too big: %uz

What it means

Error "fastcgi request record is too big: %uz" thrown in nginx/nginx.

Source

Thrown at src/http/modules/ngx_http_fastcgi_module.c:1021

            val_len = header[i].value.len;

            for (hn = header[i].next; hn; hn = hn->next) {
                val_len += hn->value.len + 2;
                ignored[header_params++] = hn;
            }

            len += ((key_len > 127) ? 4 : 1) + key_len
                   + ((val_len > 127) ? 4 : 1) + val_len;

        next_length:

            continue;
        }
    }


    if (len > 65535) {
        ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
                      "fastcgi request record is too big: %uz", len);
        return NGX_ERROR;
    }


    padding = 8 - len % 8;
    padding = (padding == 8) ? 0 : padding;


    size = sizeof(ngx_http_fastcgi_header_t)
           + sizeof(ngx_http_fastcgi_begin_request_t)

           + sizeof(ngx_http_fastcgi_header_t)  /* NGX_HTTP_FASTCGI_PARAMS */
           + len + padding
           + sizeof(ngx_http_fastcgi_header_t)  /* NGX_HTTP_FASTCGI_PARAMS */

           + sizeof(ngx_http_fastcgi_header_t); /* NGX_HTTP_FASTCGI_STDIN */

View on GitHub (pinned to 3f6f7824d4)

When it happens

Trigger: Thrown at src/http/modules/ngx_http_fastcgi_module.c:1021 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of nginx/nginx@3f6f7824d4 (2026-08-22). Data as JSON: /api/errors/2a976513002d285c. Report an issue: GitHub.