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.
Fastly interacts with many common web-standard HTTP headers. We also define a number of custom ones.
Status codes indicate the general category of an HTTP response, and some custom codes are defined or reserved by Fastly.
An informational status code that prompts the browser to pre-load assets (CSS, JS) while the server prepares the HTML response.
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