Currently, I am researching $http interceptors and noticed that there are requestError and responseError functions available.
1) Can you explain the distinction between requestError and responseError?
2) Under what circumstances does requestError get triggered?
An Unfulfilled Request Error occurs when the criteria are not met, and essential parameters are missing to locate a resource on a server, such as a missing header payload.
A Response Error is an error sent by the server in response to a request that was made, like a 404 Page Not Found error.
Check out this link for more information: https://en.wikipedia.org/wiki/List_of_HTTP_status_codes
If you receive a requestError, it means that your request cannot be processed. This could be due to an issue with the URL or the server being unavailable.
On the other hand, a responseError is related to the HTTP status codes. This indicates that the server has been reached, but there is something wrong in the process. For example, you may receive an empty response with the code 204 No Content.
The key distinction between a request error and a response error lies in their sequence within the promise chain constructed by the interceptors. Refer to this source code
// implementing interceptors forEach(reversedInterceptors, function(interceptor) { if (interceptor.request || interceptor.requestError) { chain.unshift(interceptor.request, interceptor.requestError); } if (interceptor.response || interceptor.responseError) { chain.push(interceptor.response, interceptor.responseError); } }); while (chain.length) { var thenFn = chain.shift(); var rejectFn = chain.shift(); promise = promise.then(thenFn, rejectFn); }
Therefore, when using interceptors that offer all four methods, the resulting promise will follow this pattern:
promise.then(requestFn, requestErrorFn).then(responseFn, responseErrorFn)In regards to point 2., the promise is generated through var promise = $q.when(config); once a request has been initialized. Initially, understanding the process may seem complex, but it appears that the config object contains default callbacks. If there are issues with the request syntax or configuration, or Angular faces difficulties sending the request (such as no network connection), the original promise would resolve as rejected, triggering the invocation of the requestError handler.
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