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Unable to call REST service from within Weblogic 10.3.5

 
Ong Vua
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below is my code to call a REST service. It worked fine outside of Weblogic. After I deployed it (WAR) to Weblogic 10.3.5, I got the below errors. It's the same exact code. Do you have any ideas?

401
Unauthorized: Missing required argument username

==========================================

URL url = new URL("http://servername/rest/user/login");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();

conn.setRequestMethod("POST");
conn.setDoOutput(true);
conn.setRequestProperty("Content-Type", "application/json");

//Set basic authentication in the header required by the REST service
String userPassword = "user1:password1";
String encoding = new sun.misc.BASE64Encoder().encode(userPassword.getBytes());
conn.setRequestProperty("Authorization", "Basic " + encoding);

//Submit user and password
String params = "{\"username\":\"user2\",\"password\":\"password2\"}";

conn.getOutputStream().write(params.getBytes());
conn.getOutputStream().flush();

System.out.println(conn.getResponseCode());
System.out.println(conn.getResponseMessage());
 
Ong Vua
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I printed out the output for both the good and bad ones. I noticed the content-type is text/html when I call the REST service within Weblogic. It should be application/json since the code is exactly the same.

ERROR
=====

connAllowUserInteraction: false
connContentType: text/html
connContentEncoding: null
connRequestMethod: POST
connDoInput: true
connDoOutput: true
connPermission: (java.net.SocketPermission servername:80 connect,resolve)
connURL: http://servername/rest/user/login
connHeaderField: null=[HTTP/1.1 401 Unauthorized: Missing required argument username]
connHeaderField: ETag=["1348297842"]
connHeaderField: Date=[Sat, 22 Sep 2012 07:10:42 GMT]
connHeaderField: Vary=[Accept]
connHeaderField: Transfer-Encoding=[chunked]
connHeaderField: Expires=[Sun, 19 Nov 1978 05:00:00 GMT]
connHeaderField: Last-Modified=[Sat, 22 Sep 2012 07:10:42 GMT]
connHeaderField: Connection=[close]
connHeaderField: Content-Type=[text/html]
connHeaderField: Server=[Apache/2.2.21 (Unix) mod_ssl/2.2.21 OpenSSL/0.9.8m DAV/2 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635]
connHeaderField: X-Powered-By=[PHP/5.2.17]
connHeaderField: Cache-Control=[no-cache, must-revalidate, post-check=0, pre-check=0]

GOOD
====

connAllowUserInteraction: false
connContentType: application/json
connContentEncoding: null
connRequestMethod: POST
connDoInput: true
connDoOutput: true
connPermission: (java.net.SocketPermission servername:80 connect,resolve)
connURL: http://servername/rest/user/login
connHeaderField: null=[HTTP/1.1 200 OK]
connHeaderField: ETag=["1348297985"]
connHeaderField: Expires=[Sun, 19 Nov 1978 05:00:00 GMT]
connHeaderField: Last-Modified=[Sat, 22 Sep 2012 07:13:05 GMT]
connHeaderField: Set-Cookie=[SESS0b960ba15fe89f91c2c8b1f79c14a60f=Xehs0in8jvrGLHaPBh3EqkMTdVtCAx_DhFAVse18a4E; expires=Mon, 15-Oct-2012 10:46:26 GMT; path=/; domain=servername; HttpOnly]
connHeaderField: Connection=[close]
connHeaderField: X-Powered-By=[PHP/5.2.17]
connHeaderField: Server=[Apache/2.2.21 (Unix) mod_ssl/2.2.21 OpenSSL/0.9.8m DAV/2 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635]
connHeaderField: Cache-Control=[no-cache, must-revalidate, post-check=0, pre-check=0]
connHeaderField: Transfer-Encoding=[chunked]
connHeaderField: Vary=[Accept]
connHeaderField: Date=[Sat, 22 Sep 2012 07:13:05 GMT]
connHeaderField: Content-Type=[application/json]
 
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