setRequestProperty throwing java.lang.IllegalStateException: Cannot set request property after connection is made

Question

I am getting java.lang.IllegalStateException:

java.lang.IllegalStateException: Cannot set request property after connection is made error w

Answer 1

To avoid the error:

java.lang.IllegalStateException: Cannot set request property after connection is made

We have to check the connection response before access the request header fields :

URL url = new URL("https://49.205.102.182:7070/obsplatform/api/v1/mediadevices/545b801ce37e69cc");
     urlConnection = (HttpsURLConnection) url
    .openConnection();

//Check connection
if(urlConnection.getResponseCode() == 200/*Successful*/) {      
   urlConnection.setRequestProperty("Content-Type","application/json");
  ...
  ...    
 }

Answer 2

The obvious thing is to think that you need to add properties before calling open on the URL. this however is not the case. i have seen many samples of settings being set AFTER url has been open (as counter intuitive as that is).

the problem in my case is that i had conn.getResponseCode() added in my watch list. removed that and all good.

... tricky.

Answer 3

please check below code

HttpURLConnection httpcon = (HttpURLConnection) ((new URL("a url").openConnection()));
httpcon.setDoOutput(true);
httpcon.setRequestProperty("Content-Type", "application/json");
httpcon.setRequestProperty("Accept", "application/json");
httpcon.setRequestMethod("POST");
httpcon.connect();