update readme, add SampleHTTP link

@@ -110,6 +110,7 @@ cd simple-rtmp-server/trunk
 * [Usage: How to forward stream to other server?](https://github.com/winlinvip/simple-rtmp-server/wiki/SampleForward)
 * [Usage: How to deploy low lantency application?](https://github.com/winlinvip/simple-rtmp-server/wiki/SampleRealtime)
 * [Usage: How to deploy SRS on ARM?](https://github.com/winlinvip/simple-rtmp-server/wiki/SampleARM)
+* [Usage: How to use SRS-HTTP-server to delivery HTTP/HLS stream?](https://github.com/winlinvip/simple-rtmp-server/wiki/SampleHTTP)
 * [Usage: How to show the demo of SRS?](https://github.com/winlinvip/simple-rtmp-server/wiki/SampleDemo)
 * [Usage: Solution using SRS?](https://github.com/winlinvip/simple-rtmp-server/wiki/Sample)
 * [Usage: Why SRS?](https://github.com/winlinvip/simple-rtmp-server/wiki/Product)

@@ -104,7 +104,7 @@ vhost http.srs.com {
         # main dir of vhost,
         # to delivery HTTP stream of this vhost.
         # default: ./objs/nginx/html
-        dir         ./objs/nginx/html;
+        dir         ./objs/nginx/html/hls;
     }
 }
 

@@ -195,6 +195,8 @@ int SrsHttpVhost::do_process_request(SrsSocket* skt, SrsHttpMessage* req)
         return res_xml(skt, req, str);
     } else if (srs_string_ends_with(fullpath, ".js")) {
         return res_javascript(skt, req, str);
+    } else if (srs_string_ends_with(fullpath, ".json")) {
+        return res_json(skt, req, str);
     } else if (srs_string_ends_with(fullpath, ".swf")) {
         return res_swf(skt, req, str);
     } else if (srs_string_ends_with(fullpath, ".css")) {