eclipse-vertx/vert.x · error

510 Not Extended (RFC2774)

Error message

510 Not Extended (RFC2774)

What it means

Constant defining the 510 Not Extended response expectation: with expecting(SC_NOT_EXTENDED), a 510 response fails the request future. The mandatory extension policy in the request was not met by the server; the 'message' is the reason attached to the expectation failure.

Source

Thrown at vertx-core/src/main/java/io/vertx/core/http/HttpResponseExpectation.java:330

  /**
   * 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)
   */
  HttpResponseExpectation SC_NOT_EXTENDED = status(510);

  /**
   * 511 Network Authentication Required (RFC6585)
   */
  HttpResponseExpectation SC_NETWORK_AUTHENTICATION_REQUIRED = status(511);

  /**
   * Creates an expectation asserting that the status response code is equal to {@code statusCode}.
   *
   * @param statusCode the expected status code
   */
  static HttpResponseExpectation status(int statusCode) {
    return status(statusCode, statusCode + 1);
  }

  static HttpResponseExpectation status(int min, int max) {
    return new HttpResponseExpectation() {
      @Override

View on GitHub (pinned to fb308bd8c3)

Solutions

1. Include the mandatory extension declarations the policy requires
2. Handle the failure when the extension is genuinely unsupported

When it happens

Trigger: Thrown at vertx-core/src/main/java/io/vertx/core/http/HttpResponseExpectation.java:330 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/2874622644a64b8b. Report an issue: GitHub.