* if (forceCacheResponse.code() != 504) {
 *   // The resource was cached! Show it.
 * } else {
 *   // The resource was not cached.
 * }
 * ```
 *
 * This technique works even better in situations where a stale response is better than no response.
 * To permit stale cached responses, use the `max-stale` directive with the maximum staleness in
 * seconds:
 *
 * ```java

The same way, you could raise an `HTTPException` or similar in the exit code, after the `yield`.

!!! tip

    This is a somewhat advanced technique, and in most of the cases you won't really need it, as you can raise exceptions (including `HTTPException`) from inside of the rest of your application code, for example, in the *path operation function*.

$input-box-shadow, $input-focus-box-shadow;\n    } @else {\n      box-shadow: $input-focus-box-shadow;\n    }\n  }\n  @include deprecate(\"The `form-control-focus()` mixin\", \"v4.4.0\", \"v5\", $ignore-warning);\n}\n\n// This mixin uses an `if()` technique to be compatible with Dart Sass\n// See https://github.com/sass/sass/issues/1873#issuecomment-152293725 for more details\n@mixin form-validation-state-selector($state) {\n  @if ($state == \"valid\" or $state == \"invalid\") {\n    .was-validated...

$input-box-shadow, $input-focus-box-shadow;\n    } @else {\n      box-shadow: $input-focus-box-shadow;\n    }\n  }\n  @include deprecate(\"The `form-control-focus()` mixin\", \"v4.4.0\", \"v5\", $ignore-warning);\n}\n\n// This mixin uses an `if()` technique to be compatible with Dart Sass\n// See https://github.com/sass/sass/issues/1873#issuecomment-152293725 for more details\n@mixin form-validation-state-selector($state) {\n  @if ($state == \"valid\" or $state == \"invalid\") {\n    .was-validated...