eclipse-vertx/vert.x · error

504 Gateway Timeout

Error message

504 Gateway Timeout

What it means

Constant defining the 504 Gateway Timeout response expectation: with expecting(SC_GATEWAY_TIMEOUT), a 504 response fails the request future. The gateway/proxy did not receive a timely upstream response; the 'message' is the reason on the failed future.

Source

Thrown at vertx-core/src/main/java/io/vertx/core/http/HttpResponseExpectation.java:310

  /**
   * 501 Not Implemented
   */
  HttpResponseExpectation SC_NOT_IMPLEMENTED = status(501);

  /**
   * 502 Bad Gateway
   */
  HttpResponseExpectation SC_BAD_GATEWAY = status(502);

  /**
   * 503 Service Unavailable
   */
  HttpResponseExpectation SC_SERVICE_UNAVAILABLE = status(503);

  /**
   * 504 Gateway Timeout
   */
  HttpResponseExpectation SC_GATEWAY_TIMEOUT = status(504);

  /**
   * 505 HTTP Version Not Supported
   */
  HttpResponseExpectation SC_HTTP_VERSION_NOT_SUPPORTED = status(505);

  /**
   * 506 Variant Also Negotiates (RFC2295)
   */
  HttpResponseExpectation SC_VARIANT_ALSO_NEGOTIATES = status(506);

  /**
   * 507 Insufficient Storage (WebDAV, RFC4918)
   */
  HttpResponseExpectation SC_INSUFFICIENT_STORAGE = status(507);

  /**
   * 510 Not Extended (RFC2774)

View on GitHub (pinned to fb308bd8c3)

Solutions

1. Retry the request (transient upstream slowness)
2. Increase upstream timeout budgets or shed load

When it happens

Trigger: Thrown at vertx-core/src/main/java/io/vertx/core/http/HttpResponseExpectation.java:310 when the library encounters an invalid state.

Common situations: See trigger scenarios.

Understand the failure class

• Timeouts: ETIMEDOUT, deadlines, and hung requests — what actually expires when a request times out.
• HTTP status errors: handling 4xx and 5xx responses — how to handle 4xx and 5xx responses properly.

AI-assisted analysis of eclipse-vertx/vert.x@fb308bd8c3 (2026-09-06). Data as JSON: /api/errors/e7bff182ac8f0c9c. Report an issue: GitHub.