nginx/nginx · error

NGX_LOG_ERR

NGX_LOG_ERR

Error message

client sent invalid header

What it means

Error "client sent invalid header" thrown in nginx/nginx.

Source

Thrown at src/http/v3/ngx_http_v3_request.c:541

            if (n == 0 || n == NGX_ERROR) {
                c->error = 1;
                c->log->action = "reading client request";

                ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST);
                break;
            }

            b->pos = b->start;
            b->last = b->start + n;
        }

        p = b->pos;

        rc = ngx_http_v3_parse_headers(c, st, b);

        if (rc > 0) {
            ngx_quic_reset_stream(c, rc);
            ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                          "client sent invalid header");
            ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST);
            break;
        }

        if (rc == NGX_ERROR) {
            ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
            break;
        }

        r->request_length += b->pos - p;
        h3c->total_bytes += b->pos - p;

        if (ngx_http_v3_check_flood(c) != NGX_OK) {
            ngx_http_close_request(r, NGX_HTTP_CLOSE);
            break;
        }

View on GitHub (pinned to 3f6f7824d4)

When it happens

Trigger: Thrown at src/http/v3/ngx_http_v3_request.c:541 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/ce7200b1ef540ecd. Report an issue: GitHub.