How to get response body using HttpURLConnection when code other than 2xx is returned

Question

I have problem with retrieving Json response in case when server returns error  See details below   How I perform the request  I use java net HttpURLConnection  I setup request properties  then I do   conn    HttpURLConnection  url openConnection      After that  when request is successful  I get response Json   br   new BufferedReader new InputStreamReader  conn getInputStream       sb   new StringBuilder    String output  while   output   br readLine       null      sb append output     return sb toString          and the problem is   I can t retrieve Json received when the server returns some error like 50x or 40x   Following line throws IOException   br   new BufferedReader new InputStreamReader  conn getInputStream          throws java io IOException  Server returned HTTP response code  401 for URL  www example com   The server sends body for sure  I see it in external tool Burp Suite   HTTP 1 1 401 Unauthorized    type   AuthApiException   message   AuthApiException   errors     field   email   message   Invalid username and or password        I can get response message  i e   Internal Server Error   and code  i e   500   using following methods   conn getResponseMessage    conn getResponseCode      But I can t retrieve request body    maybe there is some method I didn t notice in the library

User · Answer

If the response code isn t 200 or 2xx  use getErrorStream   instead of getInputStream

User · Answer

This is an easy way to get a successful response from the server like PHP echo otherwise an error message   BufferedReader br   null  if  conn getResponseCode      200        br   new BufferedReader new InputStreamReader conn getInputStream          String strCurrentLine          while   strCurrentLine   br readLine       null                   System out println strCurrentLine               else       br   new BufferedReader new InputStreamReader conn getErrorStream          String strCurrentLine          while   strCurrentLine   br readLine       null                   System out println strCurrentLine

User · Answer

Wrong method was used for errors  here is the working code  BufferedReader br   null  if  100  lt   conn getResponseCode    amp  amp  conn getResponseCode    lt   399        br   new BufferedReader new InputStreamReader conn getInputStream        else       br   new BufferedReader new InputStreamReader conn getErrorStream

[java] How to get response body using HttpURLConnection, when code other than 2xx is returned?

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