use http header with proper case

Author: karussell

web-bundle/src/main/resources/com/graphhopper/maps/js/graphhopper/GHRequest.js

@@ -256,7 +256,7 @@ GHRequest.prototype.doRequest = function (url, callback) {
         timeout: 30000,
         url: url,
         beforeSend: function(request) {
-            request.setRequestHeader("gh-client", "web-ui 3.0")
+            request.setRequestHeader("GH-Client", "web-ui 3.0")
         },
         success: function (json) {
             if (json.paths) {

web/src/main/java/com/graphhopper/http/CORSFilter.java

@@ -30,7 +30,7 @@ public void doFilter(ServletRequest request, ServletResponse response, FilterCha
         HttpServletResponse rsp = (HttpServletResponse) response;
         rsp.setHeader("Access-Control-Allow-Methods", "GET, POST, HEAD, OPTIONS");
         rsp.setHeader("Access-Control-Allow-Headers", "Origin,Accept,X-Requested-With,"
-                + "Content-Type,Access-Control-Request-Method,Access-Control-Request-Headers,Range,gh-client");
+                + "Content-Type,Access-Control-Request-Method,Access-Control-Request-Headers,Range,GH-Client");
         rsp.setHeader("Access-Control-Allow-Origin", "*");
 
         chain.doFilter(request, response);