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.
Essentials
Core concepts
Web interface guides
See all guides

HTTP references

Fastly respects standards in our implementations of HTTP, but in some cases there are nuances in our implementation, or extensions to the standards. We document those here.

Headers

Fastly interacts with many common web-standard HTTP headers. We also define a number of custom ones.

Response status codes

Status codes indicate the general category of an HTTP response, and some custom codes are defined or reserved by Fastly.

Network services

Security

Compute

Quick start

Building blocks

HTTP references