check if using a proxy is required, and if so, issue a warning if none is configured. p=fvanderbiest,me r=me (closes #3015)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@11038 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

tests/Request.html

@@ -319,7 +319,7 @@
     }
 
     function test_ProxyHost(t) {
-        t.plan(4);
+        t.plan(5);
 
         /*
          * Setup
@@ -334,6 +334,7 @@
         var proto = OpenLayers.Request.XMLHttpRequest.prototype;
         var _open = proto.open;
         var log = [];
+        var port;
         proto.open = function(method, url, async, user, password) {
             log.push(url);
         };
@@ -349,9 +350,17 @@
         OpenLayers.Request.GET({url: "http://bar?k1=v1&k2=v2"});
         t.eq(log.length, 1, "[1] XHR.open called once");
         t.eq(log[0], expectedURL, "[1] the URL used for XHR is correct (" + log[0] + ")");
-
+        
+        // 1 test
+        log = [];
+        OpenLayers.ProxyHost = "http://fooproxy/?url=";
+        port = window.location.port ? ':'+window.location.port : '';
+        expectedURL = window.location.protocol+"//"+window.location.hostname+port+"/service";
+        OpenLayers.Request.GET({url: expectedURL});
+        t.eq(log[0], expectedURL, "[2] proxy is not used when requesting the same server");
+        
         // 2 tests
-        log = []
+        log = [];
         OpenLayers.ProxyHost = function(url) {
             var p = OpenLayers.Util.getParameters(url);
             var p = OpenLayers.Util.getParameterString(p);
@@ -359,8 +368,8 @@
         };
         expectedURL = "http://barproxy/?k1=v1&k2=v2";
         OpenLayers.Request.GET({url: "http://bar?k1=v1&k2=v2"});
-        t.eq(log.length, 1, "[2] XHR.open called once");
-        t.eq(log[0], expectedURL, "[2] the URL used for XHR is correct (" + log[0] + ")");
+        t.eq(log.length, 1, "[3] XHR.open called once");
+        t.eq(log[0], expectedURL, "[3] the URL used for XHR is correct (" + log[0] + ")");
 
         /*
          * Teardown