In Mulesoft the HTTP listener and HTTP Request connectors are the most widely used. The HTTP listener component is used to listen for any incoming client requests. The HTTP Request connector is used to make requests to other APIs.
In this article, we will see how to create the HTTP listener and request components with Mule code.
It does not matter whether the API is developed in Mulesoft or any other tool, there should be an HTTP component that keeps listening to the requests from the client. In mulesoft, there is an HTTP listener connector that does a similar job. The client can make HTTP requests with different types of methods like GET, POST, PATCH, etc.
Let us see how to create a basic API with the minimal required components.
To create an HTTP listener connector in MuleSoft, you can use the HTTP Listener component in your Mule flow. This component listens for incoming HTTP requests on a specific host and port and triggers the flow when a request is received.
Here is an example of how you can use the HTTP Listener connector in a Mule flow:
<http:listener-config name="HTTP_Listener_Configuration" host="localhost" port="8081" doc:name="HTTP Listener Configuration"/>
<flow name="exampleFlow">
<http:listener config-ref="HTTP_Listener_Configuration" path="/example" doc:name="HTTP"/>
<logger message="Received HTTP request!" level="INFO" doc:name="Logger"/>
</flow>
In this example, the HTTP listener is configured to listen on the "localhost" host and port 8081. When a request is received at the path "/example", the flow is triggered and a log message is displayed.
You can then add additional components to the flow to process the request and generate a response. For example, you could use the Set Payload component to set the payload of the message to a specific value, or the Transform Message component to modify the message in some way.
It is not only about consuming requests, Mulesoft has the ability to make HTTP calls to other APIs as well. The HTTP request connector has the ability to make requests to the other APIS. This component supports the following features.
Ability to make requests of all types of HTTP methods.
Can make both SSL and non-SSL requests.
Support for attaching the SSL certificates.
To make an HTTP request using MuleSoft, you can use the HTTP Request connector. This connector allows you to send HTTP requests to a specified URL and receive a response.
Here is an example of how you can use the HTTP Request connector with the GET method in a Mule flow:
<http:request config-ref="HTTP_Request_Configuration" path="/users" method="GET" doc:name="HTTP"/>
<flow name="exampleFlow">
<http:request config-ref="HTTP_Request_Configuration" path="/users" method="GET" doc:name="HTTP"/>
<json:json-to-object-transformer doc:name="JSON to Object"/>
<logger message="#[payload]" level="INFO" doc:name="Logger"/>
</flow>
To make an HTTP request using MuleSoft, you can use the HTTP Request connector. This connector allows you to send HTTP requests to a specified URL and receive a response.
Here is an example of how you can use the HTTP Request connector with the POST method in a Mule flow:
<http:request config-ref="HTTP_Request_Configuration" path="/users" method="GET" doc:name="HTTP"/>
<flow name="exampleFlow">
<http:request config-ref="HTTP_Request_Configuration" path="/users" method="GET" doc:name="HTTP"/>
<json:json-to-object-transformer doc:name="JSON to Object"/>
<logger message="#[payload]" level="INFO" doc:name="Logger"/>
</flow>
In this example, the HTTP Request connector is configured to send a GET request to the URL "/users". The response is then transformed into an object and logged.
You can also specify additional parameters in the HTTP Request connector, such as the request body, headers, and query parameters. For example:
<http:request config-ref="HTTP_Request_Configuration" path="/users" method="POST" doc:name="HTTP">
<http:request-builder>
<http:header headerName="Content-Type" value="application/json"/>
<http:body><![CDATA[#[payload]]]></http:body>
</http:request-builder>
</http:request>
In this example, the HTTP Request connector is configured to send a POST request to the URL "/users" with a JSON request body and a Content-Type header.