Why do I get “Error parsing HTTP request header” when POSTing a JSON string?

Question

I am trying to send a POST request from browser to my server(local host). My request URL is :

 http://localhost:8080/myPath/myServlet?requestData={          


        

Answer 1

I had a similar issue, I was sending a POST request (using RESTClient plugin for Firefox) with data in the request body and was receiving the same message.

In my case this happened because I was trying to use HTTPS protocol in a local tomcat instance where HTTPS was not configured.