How do I look at the payload of a webwrite response when the response is a 400 or other error?

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MathWorks Support Team
回答： Richard Zapor 2025-9-6，0:14
How do I look at the payload of a "webwrite" response when the response is a 400 or other error? It throws a MATLAB error, but doesn't display any of the error messages the server sent back as payload.
My code looks something like this:
json_request = struct('a', nan);
json_response = webwrite('http://localhost:8000/reports/', json_request, ...
weboptions('MediaType', 'application/json', 'RequestMethod', 'post'))

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采纳的回答

MathWorks Support Team
So basically, you can't get the payload of an error response using "webwrite". However you can get this using the HTTP interface. It might look something like:
import matlab.net.http.*
r = RequestMessage;
resp = r.send(url); %replace url with your target address
show(resp)

更多回答（1 个）

Richard Zapor
Richard Zapor 2025-9-6，0:14
A slight variation on the Accepted answer is for when Posting a JSON string.
import matlab.net.http.*
body = MessageBody(jsonencode(data)); % or body=data_string of JSON
r = RequestMessage('POST', [], body);
resp = r.send(url);
show(resp)
resp.Body.Data %To see the error message content

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