hop-user-manual/modules/ROOT/pages/plugins/transforms/http.adoc

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= HTTP client

== Description

The HTTP client transform performs a simple call to a base URL with options appended as shown below:

====
http://<URL>?param1=value1&amp;param2=value2&amp;param3..
====

The result is stored in a String field with the specified name. 

== Options

[width="90%", options="header"]
|===
|Option|Description
|Transform name|Name of the transform; this name has to be unique in a single pipeline
|URL|The base URL string
|Accept URL from field?|Enable this option if you want to get the URL from a previous transform.
Enabling this will also allow you to specify the name of the input field.
|URL field name|The name of the incoming field that contains the URL
|Connection timeout|
|Socket timeout|The number of seconds to wait if no data is returned from the server.
|Connection close wait time
|Result fieldname|The name of the field to store results
|HTTP status code field name|The name of the field to store the HTTP response code (e.g. 200, 404)
|Response time (milliseconds) field name|The name of the field to store the response time
|Http Login|The username to be passed during HTTP (Basic) authentication
|HTTP Password|The password to be passed during HTTP (Basic) authentication
|Proxy Host|The hostname of the Proxy Server to be used
|Proxy Port|The port number of the Proxy Server to be used
|Parameters|Area where you define the parameter name-value pairs to pass on the URL
|Custom HTTP Headers|Area where you define optional HTTP headers 
|===

== FAQ
=== The HTTP client transform doesn't do anything

*Q*: The HTTP client transform doesn't do anything, how do I make it work?

*A*: The HTTP client transform needs to be triggered. Use a Row generator transform generating e.g. 1 empty row and link that with a hop to the HTTP client transform.

=== The HTTP client transform and SOAP

*Q*: Does the HTTP client support SOAP?

*A*: No, it just calls an URL with arguments. Future transforms may provide SOAP functionality, Work is underway on a WebService transform supporting WSDL.