HttpURLConnection sends a POST request even though httpCon.setRequestMethod("GET"); is set

Question

Here is my code:

String addr = "http://172.26.41.18:8080/domain/list";  URL url = new URL(addr); HttpURLConnection httpCon = (HttpURLConnection) url.openConnection(); httpCon.setDoOutput(true); httpCon.setDoInput(true); httpCon.setUseCaches(false); httpCon.setAllowUserInteraction(false); httpCon.setRequestMethod("GET"); httpCon.addRequestProperty("Authorization", "Basic YWRtaW4fYFgjkl5463");  httpCon.connect();  OutputStreamWriter out = new OutputStreamWriter(httpCon.getOutputStream());  System.out.println(httpCon.getResponseCode()); System.out.println(httpCon.getResponseMessage());  out.close(); 

What I see in response:

500 Server error

I open my httpCon var, and what I see:

POST /rest/platform/domain/list HTTP/1.1

Why is it set to POST even though I have used httpCon.setRequestMethod("GET"); to set it to GET?

Answer 1

The httpCon.setDoOutput(true); implicitly set the request method to POST because that's the default method whenever you want to send a request body.

If you want to use GET, remove that line and remove the OutputStreamWriter out = new OutputStreamWriter(httpCon.getOutputStream()); line. You don't need to send a request body for GET requests.

The following should do for a simple GET request:

String addr = "http://172.26.41.18:8080/domain/list"; URL url = new URL(addr); HttpURLConnection httpCon = (HttpURLConnection) url.openConnection(); httpCon.setUseCaches(false); httpCon.setAllowUserInteraction(false); httpCon.addRequestProperty("Authorization", "Basic YWRtaW4fYFgjkl5463"); System.out.println(httpCon.getResponseCode()); System.out.println(httpCon.getResponseMessage()); 

See also:

• Using java.net.URLConnection to fire and handle HTTP requests

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Unrelated to the concrete problem, the password part of your Authorization header value doesn't seem to be properly Base64-encoded. Perhaps it's scrambled because it was examplary, but even if it wasn't I'd fix your Base64 encoding approach.