fix baseURL handling in HttpUtils, fixes #1083

src/main/java/com/gitblit/utils/HttpUtils.java

diff --git a/src/main/java/com/gitblit/utils/HttpUtils.java b/src/main/java/com/gitblit/utils/HttpUtils.java
index 818ed49..2fd8d89 100644
--- a/src/main/java/com/gitblit/utils/HttpUtils.java
+++ b/src/main/java/com/gitblit/utils/HttpUtils.java
@@ -78,6 +78,7 @@
         	}

         }

 

+		// try to use reverse-proxy's context

         String context = request.getContextPath();

         String forwardedContext = request.getHeader("X-Forwarded-Context");

         if (StringUtils.isEmpty(forwardedContext)) {

@@ -92,13 +93,24 @@
         	context = context.substring(1);

         }

 

+		// try to use reverse-proxy's hostname

+		String host = request.getServerName();

+		String forwardedHost = request.getHeader("X-Forwarded-Host");

+		if (StringUtils.isEmpty(forwardedHost)) {

+			forwardedHost = request.getHeader("X_Forwarded_Host");

+		}

+		if (!StringUtils.isEmpty(forwardedHost)) {

+			host = forwardedHost;

+		}

+

+		// build result

 		StringBuilder sb = new StringBuilder();

 		sb.append(scheme);

 		sb.append("://");

-		sb.append(request.getServerName());

+		sb.append(host);

 		if (("http".equals(scheme) && port != 80)

 				|| ("https".equals(scheme) && port != 443)) {

-			sb.append(":" + port);

+			sb.append(":").append(port);

 		}

 		sb.append(context);

 		return sb.toString();