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

McDowell
– McDowell

2011-08-05 07:41:07 +00:00
Commented Aug 5, 2011 at 7:41 — McDowell
– McDowell, Commented Aug 5, 2011 at 7:41

user207421 · Accepted Answer · 2015-07-01 01:27:49Z

3

Call getResponseCode() after the writes.

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

edited Jul 1, 2015 at 1:27

answered Aug 5, 2011 at 7:01

user207421

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1 Comment

hoi Over a year ago

getInputStream() is called in getResponseCode()

Thilo · Accepted Answer · 2011-08-05 04:25:11Z

-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 5, 2011 at 4:25

Thilo

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2 Comments

SSpoke Over a year ago

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..

user207421 Over a year ago

connect() doesn't accelerate anything.

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