Network services
Customize your content delivery.
Full-Site Delivery
Streaming Delivery
TLS
Image Optimizer
Security
Protect your services and applications.
Next-Gen WAF
Edge Rate Limiting
Access Control Lists
Compute
Experiment with Fastly's edge computing platform.
Compute services
Testing and debugging
Edge Data Storage
Quick start
Go from zero to Fastly with these step-by-step guides and tutorials.
Delivery getting started guide
Compute getting started guide
Building blocks
Start with the basics and learn how Fastly lets you take advantage of the modern internet.
Basics
Core concepts
Web interface guides
See all guides

Log in Try Fastly free

Headers

These articles describe configuration settings and changes you can make to your headers when setting up Fastly services.

Adding or modifying headers on HTTP requests and responses

HTTP header fields are components of the header section of request and response messages in the Hypertext Transfer Protocol (HTTP). They…

Enabling cross-origin resource sharing (CORS)

Enabling Cross-Origin Resource Sharing (CORS) allows a server to indicate that other origins can request sub-resources, like scripts and…

Removing headers from backend response

You can remove headers from any backend response. This may be necessary if your application automatically sets headers. For example, Drupal…

Setting Content Type based on file extension

In some situations you may want to override the content type that a backend returns. To do that you will need to create a new header object…