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Currently the `HttpClient` always wraps errors from XHR requests, but the underlying errors are always of type `ProgressEvent`, or don't have a native error if the status code is just indicating failure (e.g. 404). This behavior does not match in the `TestRequest` class provided by `@angular/common/http/testing` where errors are considered being of type `ErrorEvent`. This is incorrect because `ErrorEvent`s provide information for errors in scripts or files which are evaluated. Since the `HttpClient` never evaluates scripts/files, and also since XHR requests clearly are documented to emit `ProgressEvent`'s, we should change the `TestSupport` to retrieve such `ProgressEvent`'s instead of incompatible objects of type `ErrorEvent`. In favor of having a deprecation period, we keep supporting `ErrorEvent` in the `TestRequest.error` signature. Eventually, we can remove this signature in the future. Resources: * https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/error_event * https://developer.mozilla.org/en-US/docs/Web/API/ErrorEvent * https://xhr.spec.whatwg.org/#event-xhr-errpr Related to: https://github.com/angular/angular/issues/34748. DEPRECATED: `TestRequest` from `@angular/common/http/testing` no longer accepts `ErrorEvent` when simulating XHR errors. Instead instances of `ProgressEvent` should be passed, matching with the native browser behavior. PR Close #36082 |
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