Add response message, if any, on HTTP status 404

Try to give as much information as possible. The connection's
response message might contain additional hints as to why the
connection could not be established.

Bug: 536541
Change-Id: I7230e4e0be9417be8cedeb8aaab35186fcbf00a5
Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>

org.eclipse.jgit.http.test/tst/org/eclipse/jgit/http/test/HttpClientTests.java

@@ -175,7 +175,9 @@ public class HttpClientTests extends HttpTestCase {
 			} catch (NoRemoteRepositoryException err) {
 				String exp = uri + ": " + uri
 						+ "/info/refs?service=git-upload-pack not found";
-				assertEquals(exp, err.getMessage());
+				assertNotNull(err.getMessage());
+				assertTrue("Unexpected error message",
+						err.getMessage().startsWith(exp));
 			}
 		}
 	}
@@ -191,7 +193,9 @@ public class HttpClientTests extends HttpTestCase {
 			} catch (NoRemoteRepositoryException err) {
 				String exp = uri + ": " + uri
 						+ "/info/refs?service=git-upload-pack not found";
-				assertEquals(exp, err.getMessage());
+				assertNotNull(err.getMessage());
+				assertTrue("Unexpected error message",
+						err.getMessage().startsWith(exp));
 			}
 		}
 	}

org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties

@@ -755,8 +755,8 @@ updatingRefFailed=Updating the ref {0} to {1} failed. ReturnCode from RefUpdate.
 upstreamBranchName=branch ''{0}'' of {1}
 uriNotConfigured=Submodule URI not configured
 uriNotFound={0} not found
+uriNotFoundWithMessage={0} not found: {1}
 URINotSupported=URI not supported: {0}
-URLNotFound={0} not found
 userConfigFileInvalid=User config file {0} invalid {1}
 walkFailure=Walk failure.
 wantNotValid=want {0} not valid

org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java

@@ -816,8 +816,8 @@ public class JGitText extends TranslationBundle {
 	/***/ public String upstreamBranchName;
 	/***/ public String uriNotConfigured;
 	/***/ public String uriNotFound;
+	/***/ public String uriNotFoundWithMessage;
 	/***/ public String URINotSupported;
-	/***/ public String URLNotFound;
 	/***/ public String userConfigFileInvalid;
 	/***/ public String walkFailure;
 	/***/ public String wantNotValid;

org.eclipse.jgit/src/org/eclipse/jgit/transport/TransportHttp.java

@@ -483,6 +483,18 @@ public class TransportHttp extends HttpTransport implements WalkTransport,
 		this.headers = headers;
 	}
 
+	private NoRemoteRepositoryException createNotFoundException(URIish u,
+			URL url, String msg) {
+		String text;
+		if (msg != null && !msg.isEmpty()) {
+			text = MessageFormat.format(JGitText.get().uriNotFoundWithMessage,
+					url, msg);
+		} else {
+			text = MessageFormat.format(JGitText.get().uriNotFound, url);
+		}
+		return new NoRemoteRepositoryException(u, text);
+	}
+
 	private HttpConnection connect(String service)
 			throws TransportException, NotSupportedException {
 		URL u = getServiceURL(service);
@@ -511,8 +523,8 @@ public class TransportHttp extends HttpTransport implements WalkTransport,
 					return conn;
 
 				case HttpConnection.HTTP_NOT_FOUND:
-					throw new NoRemoteRepositoryException(uri,
-							MessageFormat.format(JGitText.get().uriNotFound, u));
+					throw createNotFoundException(uri, u,
+							conn.getResponseMessage());
 
 				case HttpConnection.HTTP_UNAUTHORIZED:
 					authMethod = HttpAuthMethod.scanResponse(conn, ignoreTypes);
@@ -1180,9 +1192,8 @@ public class TransportHttp extends HttpTransport implements WalkTransport,
 						return;
 
 					case HttpConnection.HTTP_NOT_FOUND:
-						throw new NoRemoteRepositoryException(uri,
-								MessageFormat.format(JGitText.get().uriNotFound,
-										conn.getURL()));
+						throw createNotFoundException(uri, conn.getURL(),
+								conn.getResponseMessage());
 
 					case HttpConnection.HTTP_FORBIDDEN:
 						throw new TransportException(uri,