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HTTP references | Fastly Documentation
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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.

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