Java: HTTP PUT with HttpURLConnection

Question

How do you do do an HTTP PUT? The class I'm using seems to think it is doing a PUT but the endpoint is treating it as if I did a GET. Am I doing anything wrong?

URL url = new URL("https://...");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoOutput(true);
conn.setRequestMethod("PUT");

OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream());

writer.write(xmlString);
writer.close();

System.out.println(conn.getRequestMethod());
String response = readInputStream(conn.getInputStream());
System.out.println(response);

Which is printing:

PUT
<same content as doing a GET>

I'd rather not include another library if this one could work...

Jon Skeet · Accepted Answer · 2010-01-20 07:41:18Z

5

There's one easy way to find out: run Wireshark and see what's actually happening on the network. I've found that to be the most reliable way of diagnosing this sort of issue - your client could have bugs, the library could have bugs, the server could have bugs, but Wireshark will show you what's really happening.

EDIT: Okay, for HTTPS it's a little trickier. You can use Fiddler if you're running on Windows, which is a proxy - it can cope with HTTPS if you can persuade your client code to accept its certificate, but that's a little more intrusive... putting a proxy in the way clearly changes what the traffic looks like.

It would be better if you could talk to a debug version of the server over HTTP instead. Is that feasible in your case, or is the server completely outside your control?

edited Jan 20, 2010 at 7:41

answered Jan 20, 2010 at 7:10

Jon Skeet

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2 Comments

Paul Tarjan Over a year ago

All my traffic is https to the remote server... and wireshark can't see much inside of there. Hitting it with curl vs from java DOES look different, but what should I be looking for?

Paul Tarjan Over a year ago

Good idea. I contacted them and got a HTTP server for testing. I found my problem was the lack of a Content-Type header being rejected by their server. Thanks so much.

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