* Make helma.Http always set result.content, regardless of response status code.

* Always call responseHandler, regardless of response status code.
* Fix setFollowRedirects() bug.
Fix for bug 583 http://helma.org/bugs/show_bug.cgi?id=583

helma/Http.js

@@ -59,12 +59,17 @@ helma.Http = function() {
     var maxResponseSize = null;
 
     var responseHandler = function(connection, result) {
-       var input = new java.io.BufferedInputStream(connection.getInputStream());
+       var input;
+       try {
+          input = new java.io.BufferedInputStream(connection.getInputStream());
+       } catch (error) {
+          input = new java.io.BufferedInputStream(connection.getErrorStream());
+       }
+       if (input) {
           var body = new java.io.ByteArrayOutputStream();
           var buf = java.lang.reflect.Array.newInstance(java.lang.Byte.TYPE, 1024);
           var len;
           var currentSize = 0;
-       var maxResponseSize = self.getMaxResponseSize();
           while ((len = input.read(buf)) > -1) {
              body.write(buf, 0, len);
              currentSize += len;
@@ -72,14 +77,24 @@ helma.Http = function() {
                 throw new Error("Maximum allowed response size is exceeded");
              }
           }
+          try {
              input.close();
-       if (binaryMode) {
+          } catch (error) {
+             // safe to ignore 
+          }
+          if (binaryMode && (result.code >= 200 && result.code < 300)) {
+             // only honor binaryMode if the request succeeded
              result.content = body.toByteArray();
           } else {
              result.content = result.charset ?
                       body.toString(result.charset) :
                       body.toString();
           }
+          // adjust content length
+          if (result.content) {
+             result.length = result.content.length;
+          }
+       }
     };
 
     /** @private */
@@ -413,9 +428,13 @@ helma.Http = function() {
     };
 
     /**
-     * Overloads the default response handler
+     * Overloads the default response handler.
      * Use this do implement your own response handling, like storing the response directly to the harddisk
-     * The handler function gets two parameter, first is the Connection and second is the result object
+     * The handler function gets two parameter, first is the java.net.URLConnection and second is the result object.
+     * Note that custom response handler functions should check the HTTP status code before reading
+     * the response. The status code for successful requests is 200. Response bodies for requests with
+     * status codes less than 400 can be read from the connection's input stream, while response bodies
+     * with 4xx or 5xx status codes must be read using the error stream.
      * @param {function} Response handler function
      */
     this.setResponseHandler = function(callback) {
@@ -423,6 +442,14 @@ helma.Http = function() {
        return;
     };
 
+    /**
+     * Get the response handler. This is the function used to read the HTTP response body.
+     * @returns The response handler function
+     */
+    this.getResponseHandler = function() {
+       return responseHandler;
+    }
+
     /**
      * Executes a http request
      * @param {String} url The url to request
@@ -457,7 +484,11 @@ helma.Http = function() {
         }
         
         var conn = proxy ? url.openConnection(proxy) : url.openConnection();
-        conn.setFollowRedirects(followRedirects);
+        // Note: we must call setInstanceFollowRedirects() instead of
+        // static method setFollowRedirects(), as the latter will
+        // set the default value for all url connections, and will not work for
+        // url connections that have already been created.
+        conn.setInstanceFollowRedirects(followRedirects);
         conn.setAllowUserInteraction(false);
         conn.setRequestMethod(method);
         conn.setRequestProperty("User-Agent", userAgent);
@@ -549,26 +580,10 @@ helma.Http = function() {
            charset = charset.replace('"', ' ').trim();
            result.charset = charset;
         }
-        if (result.length != 0 && result.code == 200) {
+
+        // invoke response handler
         responseHandler(conn, result);
-            if (result.content) {
+
-               result.length = result.content.length;
-            }
-            result.length = result.content.length;
-        } else {
-           var errorStream = conn.getErrorStream();
-           if (errorStream) {
-              var body = new java.io.ByteArrayOutputStream();
-              var input = new java.io.BufferedInputStream(errorStream);
-              var buf = java.lang.reflect.Array.newInstance(java.lang.Byte.TYPE, 1024);
-              var str;
-              while ((str = input.read(buf)) > -1) {
-                 body.write(buf, 0, str);
-              }
-              input.close();
-              result.error = body.toString();
-           }
-        }
         conn.disconnect();
         return result;
     }