---
schema_version: "1"
id: 2bab6fdd65a37fb00f7efe2962e42f0cc7053d785d5daea9ffec44b455bcf571
title: REST Headers for Tooling API
collection: legacydeveloper
version: current
locale: en-us
portal_url: https://docs.salesforce.com/legacydeveloper/current/en-us/api_tooling/intro_api_tooling_rest_headers.md
canonical_url: https://developer.salesforce.com/docs/atlas.en-us.api_tooling.meta/api_tooling/intro_api_tooling_rest_headers.htm
source_site: developer.salesforce.com
content_type: documentation
content_hash: 26e0ca0a2c6def8d70d1c99dcf67f0f0a949eaa3e5ad5c16586adc8990423804
description: Tooling API provides a subset of the REST headers available in REST API.
---
# REST Headers for Tooling API

Tooling API provides a subset of the REST headers available in REST API.

Control the behavior of REST requests:

- [Call Options Header](https://developer.salesforce.com/docs/atlas.en-us.264.0.api_rest.meta/api_rest/headers_calloptions.htm)
    
    Specifies options for the client you’re using to access REST API resources. For example, you can provide a default namespace prefix so that you don’t need to specify the prefix in your code.
- [Limit Info Header](https://developer.salesforce.com/docs/atlas.en-us.264.0.api_rest.meta/api_rest/headers_api_usage.htm)
    
    This response header is returned in each request to REST API (except for calls to the Versions URI, /, which do not count towards your org’s limit). You can use the information to monitor API limits.
- [Package Version Header](https://developer.salesforce.com/docs/atlas.en-us.264.0.api_rest.meta/api_rest/headers_packageversion.htm)
    
    Specifies the version of each package referenced by a client. A package version is a number that identifies the set of components and behavior contained in a package. This header can also be used to specify a package version when making calls to an Apex REST web service.
- [Query Options Header](https://developer.salesforce.com/docs/atlas.en-us.264.0.api_rest.meta/api_rest/headers_queryoptions.htm)
    
    Specifies options used in a query, such as the query results batch size. Use this request header with the Query resource.