nginx/nginx · error

NGX_LOG_ERR

NGX_LOG_ERR

Error message

image filter: multipart/x-mixed-replace response

What it means

Error "image filter: multipart/x-mixed-replace response" thrown in nginx/nginx.

Source

Thrown at src/http/modules/ngx_http_image_filter_module.c:251

    if (ctx) {
        ngx_http_set_ctx(r, NULL, ngx_http_image_filter_module);
        return ngx_http_next_header_filter(r);
    }

    conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module);

    if (conf->filter == NGX_HTTP_IMAGE_OFF) {
        return ngx_http_next_header_filter(r);
    }

    if (r->headers_out.content_type.len
            >= sizeof("multipart/x-mixed-replace") - 1
        && ngx_strncasecmp(r->headers_out.content_type.data,
                           (u_char *) "multipart/x-mixed-replace",
                           sizeof("multipart/x-mixed-replace") - 1)
           == 0)
    {
        ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                      "image filter: multipart/x-mixed-replace response");

        return NGX_ERROR;
    }

    ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_image_filter_ctx_t));
    if (ctx == NULL) {
        return NGX_ERROR;
    }

    ngx_http_set_ctx(r, ctx, ngx_http_image_filter_module);

    len = r->headers_out.content_length_n;

    if (len != -1 && len > (off_t) conf->buffer_size) {
        ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                      "image filter: too big response: %O", len);

View on GitHub (pinned to 3f6f7824d4)

When it happens

Trigger: Thrown at src/http/modules/ngx_http_image_filter_module.c:251 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/f36faf4f35856ad6. Report an issue: GitHub.