Intercept an outgoing HttpRequest and optionally transform it or the
response.
Typically an interceptor will transform the outgoing request before returning
next.handle(transformedReq). An interceptor may choose to transform the
response event stream as well, by applying additional Rx operators on the stream
returned by next.handle().
More rarely, an interceptor may choose to completely handle the request itself,
and compose a new event stream instead of invoking next.handle(). This is
acceptable behavior, but keep in mind further interceptors will be skipped entirely.
It is also rare but valid for an interceptor to return multiple responses on the event stream for a single request.
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Intercepts
HttpRequestand handles them.Most interceptors will transform the outgoing request before passing it to the next interceptor in the chain, by calling
next.handle(transformedReq).In rare cases, interceptors may wish to completely handle a request themselves, and not delegate to the remainder of the chain. This behavior is allowed.