eclipse-vertx/vert.x · error

400 Bad Request

Error message

400 Bad Request

What it means

Constant defining the 400 Bad Request response expectation: when applied via expecting(...), a response with status 400 fails the request future instead of being delivered normally. The 'message' is the human-readable reason used in the resulting expectation failure, not a thrown error at a guard site.

Source

Thrown at vertx-core/src/main/java/io/vertx/core/http/HttpResponseExpectation.java:150

  /**
   * 307 Temporary Redirect (since HTTP/1.1)
   */
  HttpResponseExpectation SC_TEMPORARY_REDIRECT = status(307);

  /**
   * 308 Permanent Redirect (RFC7538)
   */
  HttpResponseExpectation SC_PERMANENT_REDIRECT = status(308);

  /**
   * Any 4XX client error
   */
  HttpResponseExpectation SC_CLIENT_ERRORS = status(400, 500);

  /**
   * 400 Bad Request
   */
  HttpResponseExpectation SC_BAD_REQUEST = status(400);

  /**
   * 401 Unauthorized
   */
  HttpResponseExpectation SC_UNAUTHORIZED = status(401);

  /**
   * 402 Payment Required
   */
  HttpResponseExpectation SC_PAYMENT_REQUIRED = status(402);

  /**
   * 403 Forbidden
   */
  HttpResponseExpectation SC_FORBIDDEN = status(403);

  /**
   * 404 Not Found

View on GitHub (pinned to fb308bd8c3)

Solutions

1. Handle the failed response future in your expecting() chain
2. Fix the client request (malformed syntax, bad framing) that triggers 400

When it happens

Trigger: Thrown at vertx-core/src/main/java/io/vertx/core/http/HttpResponseExpectation.java:150 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of eclipse-vertx/vert.x@fb308bd8c3 (2026-09-06). Data as JSON: /api/errors/51daa4ddd5ca8802. Report an issue: GitHub.