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 apologize for not answering questions seriously before.

1.Maybe it caused by special characters.You can get details from this url。https://bz.apache.org/bugzilla/show_bug.cgi?id=60594

solve it by：

encodeURIComponent(JSON.stringify(data))

or change your tomcat version to 7.0.67 or lower. According to developers's opinion, tomcat developers in the following versions set the option to allow |，{，}. Get detail http://tomcat.apache.org/tomcat-8.0-doc/config/systemprops.html#Other

The new environment variable will be included in: - trunk for 9.0.0.M18 onwards

• 8.5.x for 8.5.12 onwards

• 8.0.x for 8.0.42 onwards

• 7.0.x for 7.0.76 onwards2.

Another reason maybe that Request header is too large.You can solve this by modifying the server.xml.

Hope it works for you！