How do I get the response object from call-with-input-request when the HTTP status is >= 300?
The docs say this about call-with-input-request:
Returns three values: The result of the call to reader (or #f if there is no message body in the response), the request-uri of the last request and the response object. If the response code is not in the 200 class, it will raise a condition of type (exn http client-error), (exn http server-error) or (exn http unexpected-server-response), depending on the response code. This includes 404 not found (which is a client-error).
This means that call-with-input-request signals a non-continuable condition, which (as far as I understand) means that the function does not return, and I cannot get access to the response object that would otherwise be returned. Therefore I don't see how I can actually get access to the response object corresponding to this request.
I still want to be able to inspect the response, even if its status is in the 30x-50x range. For example, I want to be able to print the HTTP reason string, or log it for debugging later. How can I achieve this?
If you trigger the exception from the REPL, you can inspect it with the ,exn comma-command. Then you'll notice the condition has a response property which is a contains the status code, headers etc.
The docs could be improved in this regard I'm sure. Perhaps you have a suggestion where to put this? The problem is that the exact contents of the condition object depend on where the condition was thrown, so not all properties will always be available.