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vijaymanoharan
Level 2
January 6, 2022

Calling Servlet through dispatcher loses Body payload data

  • January 6, 2022
  • 2 replies
  • 3604 views

I'm calling a servlet through POST method and passing data. When i tried to hit the author/publish instance directly, its working as expected.

Whereas when I'm hitting the servlet through dispatcher, the request payload data is coming as EMPTY.

 

Please share your inputs on the same

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2 replies

milind_bachani
Adobe Employee
milind_bachaniAdobe Employee
Adobe Employee
January 6, 2022

Hi @vijaymanoharan 

Are you sure that the payload is empty and you are not getting a 404.
You get a 404 on dispatcher if servlet path is not allowed in the PUBLISH-FILTERS.

Can you please analyse the requests in network tab of dev-tools and post relevant screeenshots, so that we can guide further.

Thanks.

    V
    vijaymanoharanAuthor
    Level 2
    January 7, 2022

    Hi @milind_bachani , the payload is coming as empty whereas the payload is a JSON which i'm passing.

     

    Note: Im trying to hit the servlet through external server. 

      milind_bachani
      Adobe Employee
      milind_bachaniAdobe Employee
      Adobe Employee
      January 7, 2022

      Hi @vijaymanoharan 

      Since you are hitting from external server, I suspect few things :

       

      • Are clientheaders set in dispatcher config under /clientheaders
      • Are you explicitly handling CORS ? - You can test that using CORS chrome extension and hit the servlet and check
      • Since the request is coming from external server, the body might be sent as plain-text instead of application/json but since your servlet was expecting JSON it comes up empty
      • Lastly, can you please hit <dispatcher_domain>/bin/notification POST using postman or any other api platform and check the behaviour.
        • If it works fine on postman with body you are sending, then possibly you need to check the external server configuration.
        • If NOT, then it has something to do with dispatcher config. By doing this activity, we can actually figure out the root-cause and the server responsible for bringing up such issue.

      Thanks.

        Shubham_borole
        Community Advisor
        Shubham_boroleCommunity Advisor
        Community Advisor
        January 7, 2022

        Hi @vijaymanoharan 

         

        What does the servlet url look like?

        Can you please check the dispatcher any file for '/filter' section 

        For Eg: For /bin/test/myservlet
/0001 { /type "allow" /url "/bin/test/myservlet*" }

        Also we can check the dispatcher debug and trace logs if any information regarding this is noted.

         

        Thanks

         

          V
          vijaymanoharanAuthor
          Level 2
          January 7, 2022

          Hi @shubham_borole ,

           

          The dispatcher filter file allows the particular path.

           

          The dispatcher.log shows the trace as follow

           

          [Fri Jan 07 08:25:11 2022] [D] [pid 6550] Found farm publishfarm for project.dev
          [Fri Jan 07 08:25:11 2022] [D] [pid 6550] checking [/bin/notification]
          [Fri Jan 07 08:25:11 2022] [D] [pid 6550] request URL has no extension: /bin/notification
          [Fri Jan 07 08:25:11 2022] [D] [pid 6550] cache-action for [/bin/notification]: NONE
          [Fri Jan 07 08:25:11 2022] [T] [pid 6550] Filter rule entry /005 allowed 'POST /bin/notification HTTP/1.1'
          [Fri Jan 07 08:25:11 2022] [D] [pid 6550] Reusing connection: 10.44.1.98:4503
          [Fri Jan 07 08:25:11 2022] [D] [pid 6550] Connected to backend 0 (10.44.1.98:4503)
          [Fri Jan 07 08:25:11 2022] [T] [pid 6550] request.uri = "/bin/notification"
          [Fri Jan 07 08:25:11 2022] [T] [pid 6550] request.headers[Content-Type] = "application/json; charset=utf-8"
          [Fri Jan 07 08:25:11 2022] [T] [pid 6550] request.headers[Via] = "1.1 project.dev (dispatcher)"
          [Fri Jan 07 08:25:11 2022] [T] [pid 6550] request.headers[X-Forwarded-For] = "10.44.1.98"
          [Fri Jan 07 08:25:11 2022] [T] [pid 6550] request.headers[Server-Agent] = "Communique-Dispatcher"
          [Fri Jan 07 08:25:11 2022] [T] [pid 6550] request.headers[Host] = "10.44.1.98:4503"
          [Fri Jan 07 08:25:11 2022] [D] [pid 6550] Sending request body to remote server
          [Fri Jan 07 08:25:11 2022] [D] [pid 6550] Request body sent to remote server
          [Fri Jan 07 08:25:11 2022] [D] [pid 6550] No socket reuse: neither GET nor HEAD
          [Fri Jan 07 08:25:11 2022] [I] [pid 6550] "POST /bin/notification" 500 none [publishfarm/0] 8ms
          [Fri Jan 07 08:25:11 2022] [D] [pid 6550] Found farm publishfarm for project.dev

           

          Note: I'm trying to hit the servlet from external server

            Shubham_borole
            Community Advisor
            Shubham_boroleCommunity Advisor
            Community Advisor
            January 8, 2022

            Do you have any other servlets that use the /bin based servlet resolutions and are working?

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