Java URL / HttpURLConnection how to avoid InputStream while posting?

Question

Is it possible to do a POST method request to some URL and avoid reading the response?

No matter how hard I try to avoid reading the response the data never seems to reach the server unless I read the response.. strange?

I really have no point in reading any response data as all I will be doing is posting data.. (the response will always be blank anyways)

 URL postURL = new URL("http://www.example.com/test/");
 HttpURLConnection con = (HttpURLConnection) postURL.openConnection();
 con.setUseCaches(false);
 con.setDoOutput(true);
 con.setDoInput(false); //why even make this if it doesn't function?
 con.setRequestMethod("POST"); 

 //PrintWriter out = new PrintWriter(con.getOutputStream());
 OutputStream out = con.getOutputStream();
 byte[] /*String postStr*/ bPost = ("foo1="+URLEncoder.encode("bar1")+"&"+  
                       "foo2="+URLEncoder.encode("bar2")+"&"+   
                       "foo3="+URLEncoder.encode("bar3").getBytes();
 out.write(bPost);

 //out.println(postStr); // send to server
 out.flush();
 out.close();   // close outputstream
 //con.getInputStream().close(); //thought maybe this would help but no change.


 /*
 //If I uncomment this it will work.
 String inputLine="";   //Stores the line of text returned by the server
 String resultsPage=""; // Stores the complete HTML results page

 BufferedReader in = new BufferedReader(
             new InputStreamReader(con.getInputStream()));

 while ((inputLine = in.readLine()) != null)
       resultsPage+=inputLine;
 in.close();
 */

Related: [Safe use of HttpURLConnection](http://stackoverflow.com/questions/4767553) — McDowell, Aug 05 '11 at 07:41

user207421 · Accepted Answer · 2015-07-01T01:27:49.913

3

Call getResponseCode() after the writes.

This will also give you 404 as a response code rather than FileNotFoundException.

edited Jul 01 '15 at 01:27

answered Aug 05 '11 at 07:01

user207421

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getInputStream() is called in getResponseCode() – hoi Feb 02 '17 at 07:41

score -1 · Answer 2 · answered Aug 05 '11 at 04:25

-1

Have you tried calling con.connect()?

Otherwise it will probably do that "lazily" when it absolutely has to (POST buffer full, starting to read the response headers, etc).

answered Aug 05 '11 at 04:25

Thilo

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where do I put con.connect()? before i write? is there any bad side effects? .. i call flush and hopefully inputStream is disabled? it shouldn't fill that up. or?, btw this isn't a keep-alive connection it's just a simple post to a url.. – SSpoke Aug 05 '11 at 04:28
connect() doesn't accelerate anything. – user207421 Aug 06 '11 at 23:34

Java URL / HttpURLConnection how to avoid InputStream while posting?

2 Answers2