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I am interested in reusing an HttpUrlConnection (as part of a statefull protocol between server and client that I'm developing). I know that there is an Connection=keep-alive header for persistent http. Now, I want to know how to reuse such a conenction. I have written this code:
URL u = new java.net.URL("http://localhost:8080/Abc/Def"); HttpURLConnection c = (HttpURLConnection) u.openConnection(); c.setRequestMethod("GET"); c.setRequestProperty("Connection", "keep-alive"); c.setHeader("A","B"); c.getInputStream() //here I see that server gets my messages (using DEBUG) c.setHeader("B","C"); // Now how do I resend this "B" header to the server, I tried re-connect etc,but nothing gets it to work.
And the server also perform response.setHeader("Connection", "keep-alive");
I've looked in many forums, but no one wrote about this. Maybe HttpURLConnection doesn't handle this?
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You don't. You close this one and create a new one.
URLConnection is the base class. HttpURLConnection is a derived class which you can use when you need the extra API and you are dealing with HTTP or HTTPS only. HttpsURLConnection is a 'more derived' class which you can use when you need the 'more extra' API and you are dealing with HTTPS only.
Set the request method in HttpURLConnection instance, default value is GET. Call setRequestProperty() method on HttpURLConnection instance to set request header values, such as “User-Agent” and “Accept-Language” etc. We can call getResponseCode() to get the response HTTP code.
it's not thread safe. you shouldn't cache/share a connection. just create a new connection for each request. there is certainly a little overhead in creating new connections, but it is very small, you shouldn't worry about it.
You don't. You close this one and create a new one. It does TCP connection pooling and keepalive behind the scenes.
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