# tREST
Availability-note[Deprecated](https://help.talend.com/r/en-US/Cloud/labels-on-talend-help-center/availability-deprecated)
This content is deprecated.
Information noteImportant: This component has been removed from Talend Studio 8.0 R2025-04 onwards. Use tHTTPClient or tRESTClient instead.
Serves as a REST Web service client.
The tREST component sends HTTP requests to a REpresentational State Transfer (REST) Web service provider and gets responses correspondingly.
## tREST Standard properties
The Standard tREST component belongs to the Internet family.
Information noteNote: This component is designed for Data Integration Jobs. It is not supported in ESB use cases. To build Jobs that need to be deployed into the Talend Runtime, use the tRESTClient or tHTTPClient components which are best suited for the Talend Runtime.
The component in this framework is available in all Talend products.
## Basic settings
| Properties | Description |
| --- | --- |
| Schema and Edit
Schema | A schema is a row description, it defines the number of fields
that will be processed and passed on to the next component.
This component always uses a built-in, read-only schema that
contains two columns:
- Body: stores the result from
the server end.
- ERROR\_CODE: stores the HTTP
status code from the server end when an error occurs during the
invocation process. The specific meanings of the errors codes are
subject to definitions of your Web service provider. For reference
information, visit http://en.wikipedia.org/wiki/List\_of\_HTTP\_status\_codes.
Click Edit Schema to view the
schema structure.
Information noteWarning:
*Changing the schema type may result in loss of the
schema structure and therefore failure of the
component.* |
| URL | Type in the URL address of the REST Web server to be invoked. |
| HTTP Method | From this list, select an HTTP method that describes the desired
action. The specific meanings of the HTTP methods are subject to
definitions of your Web service provider. Listed below are the
generally accepted HTTP method definitions:
- GET: retrieves data from the
server end based on the given parameters.
- POST: creates and uploads data
based on the given parameters.
- PUT: updates data based on the
given parameters, or if the data does not exist, creates it.
- DELETE: removes data based on the
given parameters. |
| HTTP Headers | Type in the name-value pair(s) for HTTP headers to define the
parameters of the requested HTTP operation.
For the specific definitions of HTTP headers, consult your REST
Web service provider. For reference information, visit http://en.wikipedia.org/wiki/List\_of\_HTTP\_headers. |
| HTTP Body | Type in the payload to be uploaded to the server end when the
POST or PUT action is selected. |
## Advanced settings
| Properties | Description |
| --- | --- |
| tStatCatcher Statistics | Select this check box to gather the Job processing metadata at the
Job level as well as at each component level. |
## Global Variables
| Variables | Description |
| --- | --- |
| Global Variables | ERROR\_MESSAGE: the error message generated by the
component when an error occurs. This is an After variable and it returns a string. This
variable functions only if the Die on error checkbox is
cleared, if the component has this checkbox.
A Flow variable functions during the execution of a component
while an After variable functions after the execution of the component.
To fill up a field or expression with a variable, press Ctrl+Space to access the variable list and choose the variable to use from
it.
For more information about variables, see [Using contexts and variables](https://help.qlik.com/talend/r/en-US/8.0/studio-user-guide/contexts-and-variables). |
## Usage
| Usage guidance | Description |
| --- | --- |
| **Usage rule** | Use this component as a REST Web service client to communicate
with a REST Web service provider. It must be linked to an output
component. |
| Limitation | JRE 1.6 must be running for this component to work
properly. |
**Related concepts**
* [Creating and retrieving data by invoking REST Web service](https://help.qlik.com/talend/en-US/components/8.0/rest/trest-tlogrow-creating-and-retrieving-data-by-invoking-rest-web-service-standard-component-this)