There is a presentation server for an application. (The application has App server, Presentation server & Relay server)
If I try to ping the presentation server, will it respond to my ping requests?
(The app server is responding to ping requests)
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Having a grpc client and server and they are exchanging messages in grpc unary mode. I want to log all the messages the client sends to the server without changing a single line of code in both client or server. I came across to Nginx with its new graceful grpc support. Is it possible to route grpc messages from client to server via Nginx while sending a copy of them to a remote logging service? If No, please let me know if there are any other tools out there that do the same stuff.
The problem is this:
I decided to make a messenger/chat (VCL application) with callback on DataSnap technology (IDE Delphi XE6), has created a simple DataSnap server (tcp / ip + http) without the database, and thick client.
All works fine if the whole thing run on a local network (tcp / ip) or via the Internet (http).Problems arise when run over HTTP and the client machine has a HTTP proxy server, the client application can not connect to my DataSnap server application. Client application gets error "10061 connection refused"
or "Expected datasnap context in request http://[YourServerIP]:[YourPort]/datasnap/tunnel".
I tried to enter IP and port of the proxy server to params of component TSQLConnection.Driver params DSProxyHost and DSProxyPort, turned off my firewall and antivirus software, checked allows traffic to the proxy ip + port, but the problem has not disappeared.
After few days searches, without results, i decided listening requests from client application and response of my DataSnap Server application in HTTPTrace procedure of DSHTTPService1 component, also with software HTTPDebugerPro, and i noticed interesting thing:
when client app connecting to ds server app without proxy server, in request ds server app receive URI with this text "/datasnap/tunnel" and all works fine ds server response "200, OK".
when client app connecting to ds server app with proxy, in request ds server app receive URI with text "http://[YourServerIP]:[YourPort]/datasnap/tunnel" and raised exception with response error "404, Expected datasnap context in request http://YourServerIP:YourPort/datasnap/tunnel".
Has anyone knows solution about this problem? How to connect DataSnap client to DataSnap server via proxy server? I searched solution for this problem several days, I shoveled the Internet but have not yet found a solution.
We have an application which uses SignalR hubs but the hubs location is in a different server not in the application server.
All the signalR ping requests from the application are going to application server, how to make ping requests to hit the signalR server (different hub server).
The question is about ping url when the hub location is in a different server.
Thanks,
Pavan
So, a Client connects to Server A, which then creates an iframe pointed at Server B. The Client submits a request through the iframe to Server B. Does Server B see the request as coming from the Client or from Server A?
Application: I have two services running on one machine, let's say one on port 443 and one on port 9090. Port 9090 is closed at the firewall, but it can be accessed from other services on the host machine. If I host a page on 443 with an iframe directed at port 9090, will that service see that request as coming from the host machine and send the data, or from the external client and drop the connection?
Server B will see the request coming from the client browser not from server A.
Generally Iframes are requesting its URL from the client browser.
I would like to use tomcat to serve a web page. The webpage will make a connection using websockets over port 80. Does this mean I need a java servlet (hosted by tomcat) to listen for a websocket connection? Or can I use some other application to say written in erlang to listen for the websocket connections.
I'm confused about whether if I use tomcat to serve the webpage, I'm also forced to use it to listen for websockets over port 80. I would have tomcat and the erlang app on the same machine.
The WebSocket server could be listening on some other port than the one used to serve your HTML page (80 presumably) and might even be on a separate domain/server. As long as it respects the specification, you could use any language/framework to write a WebSocket server.
There are issues of Cross Domain scripting which is usually blocked by Web Clients. However, i ask my self, why don't you let your favorite Erlang web server like Yaws or Mochiweb serve that very page from which web socket requests will be initiated?
On the same server, you can have both Tomcat and another Web server running. You can let Tomcat be on Port 80, while the other Erlang web server on say port 8080. Let the page that points to your web sockets page have the link as say: Click here to start web sockets application
You can as well do port forwarding and stuff like that on your Server room firewall (router) to map requests incoming on one port to another