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 when setRequestProperty method is called after url.openConnection();

Here is what i am trying:

URL url = new URL("https://49.205.102.182:7070/obsplatform/api/v1/mediadevices/545b801ce37e69cc");
         urlConnection = (HttpsURLConnection) url
        .openConnection();
urlConnection.setRequestProperty("Content-Type","application/json");

any suggestions please? Thanks in advance.

Use this line "urlConnection.setRequestProperty("Content-Type", "application/json");"before creating an Object and adding Url parameter. — Amarnath Baitha, Mar 11 '14 at 08:46
please look this link for http://stackoverflow.com/questions/2793150/how-to-use-java-net-urlconnection-to-fire-and-handle-http-requests — Amarnath Baitha, Mar 11 '14 at 08:58
@AmarRaj i checked the link. there also setting properties after connection created(opened). — siva, Mar 11 '14 at 11:45

Pablo Retyk · Accepted Answer · 2020-06-25T13:33:04.900

44

This usually happens if you have in the debug watchers calls, such as conn.getResponseCode() or anything that queries the request result before the request was actually issued or completed. This causes, that during debug, a request is performed by the watcher, before having properly set you request, and then it becomes invalid.

edited Jun 25 '20 at 13:33

answered Feb 22 '16 at 15:34

Pablo Retyk

5,432
6
39
59

1

Thank you! This should be accepted as the correct answer. – Otziii Aug 10 '17 at 13:28
DEBUG WATCHER ! remove DEBUG WATCHER variable – user1269737 Apr 02 '19 at 18:57
Yes I see this when trying to run the app using the android profiler. Kind of frustrating, not sure how I can proceed – 1800 INFORMATION Dec 15 '20 at 01:53

score 5 · Answer 2 · answered Apr 29 '15 at 01:09

5

I only have this issue while in debugging mode, Run without debugging (You can print logs) everything should work fine

answered Apr 29 '15 at 01:09

kyildizoglu

97
2
7

I only have this issue while in debugging mode - so do I – Tigran Sarkisian Nov 26 '15 at 09:06
I have this issue in non-debugging mode also! – Sreekanth Karumanaghat Apr 07 '20 at 13:38
@SreekanthKarumanaghat Check for calls (including logging) that accesses functions like `getHeaderFields()` on the connection, as these can cause early-sending of the request. For me, this line was the culprit: `Log.i(TAG, "HeaderFields:" + conn.getHeaderFields());` – Venryx May 26 '20 at 15:19

score 2 · Answer 3 · answered Apr 15 '16 at 01:19

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.

score 1 · Answer 4 · answered Mar 11 '14 at 08:48

1

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();

answered Mar 11 '14 at 08:48

Kanaiya Katarmal

5,475
4
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52

Thanks for response, i tried but getting similar error java.lang.IllegalStateException: Already connected. – siva Mar 11 '14 at 11:39
same question on stackoverflow see this http://stackoverflow.com/questions/7726195/setresponsecode-method-giving-java-lang-illegalstateexception-cannot-set-method – Amarnath Baitha Mar 11 '14 at 12:46

score 0 · Answer 5 · answered Jan 31 '15 at 23:10

0

I was getting the same exception on setRequestProperty("Range","byte=" + downloadedSize + "-") . After adding connection.setChunkedStreamingMode(0); the issue disappeared

answered Jan 31 '15 at 23:10

mdavid

503
5
16

score 0 · Answer 6 · answered May 29 '15 at 12:51

I'm having the same issue. I was observing this issue on Nexus 5. Code of my app constantly fails with the same exception (or its twin brother "cannot set request method ..")

What I've observed that it happens if i leave phone for a while. One it starts failing it fails all the time - but if i restart phone/emulator it's ok once again).

My suspicion is its either some bug in connection pooling on framework side, or somewhere in code resources are leaked.

score 0 · Answer 7 · answered Aug 25 '18 at 21:48

i found the problem it's about ordering the code, if you are trying to add header and post parameters both, it's important to be careful about this

HttpURLConnection connection = (HttpURLConnection) urlConnection;

////        Add Request Headers
for (NameValuePair nvp :
         request[0].getHeaderParams()) {
     connection.setRequestProperty(nvp.getName(),nvp.getValue());
     }
// done

connection.setDoInput(true);
connection.setDoOutput(true);
connection.setRequestMethod("POST");
////         Add Post Parameters
OutputStream outputStream = urlConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream));
List<NameValuePair> params = new ArrayList<>(request[0].getPostParams());
bufferedWriter.write(getQuery(params));

// done
connection.setConnectTimeout(3000);
connection.setReadTimeout(3000);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.flush();
outputStream.close();
connection.connect();

in here, i have added header parameters then set setDoInput and setDoOutput then setRequestMethod and finally you can add POST parameters. i don't know what is wrong with setRequestMethod but i think its preparing the connection by opening it or something and that's why it throws exception

score 0 · Answer 8 · answered Mar 19 '19 at 12:44

0

not invoke setRequestProperty after write byte to OutputStream.

OutputStream os = connection.getOutputStream();
os.write("k=v".getBytes());
os.close();

you should invoke setRequestProperty above the code

answered Mar 19 '19 at 12:44

jinzuchi

29
5

score 0 · Answer 9 · answered Nov 20 '19 at 18:28

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");
  ...
  ...    
 }

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

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