[HtmlUnit] Patch to handle comma delimited HTTP location header values during a redriect

[<Mik...@su...>]

Here's a patch that fixes a intermittent problem I've been having for a long
time using HtmlUnit to test a application running in the WebSphere Test
Environment within WebSphere Application Developer 4.0.3.  The problem occurs
during a HTTP redirect when HttpClient returns a value for the location header
that is a comma delimited list.  The patch changes HtmlUnit to ignore everything
after the first value in the list.  The code in HttpClient that creates the
comma delimited list is in
org.apache.commons.httpclient.HttpMethodBase.readResponseHeaders().  The code
includes the following comment which is interesting but not enlightening.

     * "It must be possible to combine the multiple header fields into one
     * "field-name: field-value" pair, without changing the semantics of the
     * message, by appending each subsequent field-value to the first, each
     * separated by a comma." - HTTP/1.0 (4.3)

Mike Bresnahan

Index: src/java/com/gargoylesoftware/htmlunit/WebClient.java
===================================================================
RCS file:
/cvsroot/htmlunit/htmlunit/src/java/com/gargoylesoftware/htmlunit/WebClient.java,v
retrieving revision 1.23
diff -c -r1.23 WebClient.java
*** src/java/com/gargoylesoftware/htmlunit/WebClient.java       20 Nov 2002
22:19:00 -0000      1.23
--- src/java/com/gargoylesoftware/htmlunit/WebClient.java       26 Nov 2002
19:33:39 -0000
***************
*** 904,910 ****
              try {
                  locationString = webResponse.getResponseHeaderValue
("Location");
                  if( locationString != null ) {
!                     newUrl = expandUrl( url, locationString );
                  }
              }
              catch( final MalformedURLException e ) {
--- 904,918 ----
              try {
                  locationString = webResponse.getResponseHeaderValue
("Location");
                  if( locationString != null ) {
!                   // HttpClient sometimes returns a delimited list of values
where the delimiter is a comma.
!                   // We'll take a guess and go with the first value.
!                   int indexOfComma = locationString.indexOf(',');
!                   if( indexOfComma >= 0) {
!                       newUrl = expandUrl( url, locationString.substring(0,
indexOfComma));
!                   }
!                   else {
!                       newUrl = expandUrl( url, locationString);
!                   }
                  }
              }
              catch( final MalformedURLException e ) {