In Java, using httpclient5.1.3 and httpcore5.1.3 I'm trying to do a POST request to an API URL. However, I keep receiving a 400 Bad request. Are there any tools so I can debug how the request is exactly received by the API? To see how the headers and body are received exactly?
How can I analyze the header and body posted by my API call
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You could use Postman or Advanced Rest Client (A plugin for Chrome) that allows you to send HTTP requests and see the responses. There is a tool called Fidler that shows HHTP traffic.
Also there are some other HTTP clients you could use: