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# Request/Reply

In a request/reply scenario, one application sends a message to another and expects a reply message such as a response code, query result, or receipt confirmation. For more details, see the FTL Development guide, Request/Reply and the FTL Concepts Guide, Request/Reply with Inbox Token.

The `tibftlrequest` and `tibftlreply` applications are used in this example.

Perform these steps:

1. Open two terminals. Make sure you have run the `setup` command and started the FTL server. See the Command Reference.

2. In one of the terminals, start the `tibftlreply` application which is in the `samples\bin` directory. The start command and output follows.

   - Linux and macOS:

         $./tibftlreply localhost:8080

   - Windows:

         >tibftlreply localhost:8080

3. Check the reply.

    ## tibftlreply# (FTL) TIBCO FTL Version <n.n>	V<n>## Client name tibftlreply_44316#Waiting for message(s)

1. In the other terminal, start `tibftlrequest` which is in the `samples\bin` directory to send a request to `tibftlreply`.

   - Linux and macOS:

         $./tibftlrequest localhost:8080

   - Windows:

         >tibftlrequest localhost:8080

## Check Your Result

The reply returns quickly and you’ll see output like the following.

Requester

The `Sending request message`: line shows the message `tibftlrequest` sent to `tibftlreply`. Two string fields are defined, including a field `type` with the value `request`. After the replyer responds the `Reply message received` line displays the response.

    ## tibftlrequest# (FTL) TIBCO FTL Version <n.n>	V<n>## Client name tibftlrequest_44319#Sending request message: {string:type="request", string:client_name="tibftlrequest_44319"}Reply message received: {string:type="reply", string:client_name="tibftlreply_44316"}

Replier

The `tibftlreply` application looked for a field called `type` with a value of `request`. When the request is received, the application returns a message with the `type` field value `reply` and the `client_name` field with the client identifier of the `tibftlreply` application.

    Received request: {string:type="request", string:client_name="tibftlrequest_110685"}Reply sent: {string:type="reply", string:client_name="tibftlreply_110663"}

A request can contain any number of fields with any type of content needed by an application.

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TIBCO FTL® - Enterprise Edition

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