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Stackpath.md

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Stackpath

  • Tested version: in the beginning of 2019

Basics

  • similar to Nginx
  • doesn't allow in the path: %00 0x00 % space
  • doesn't allow %2f as the first slash (400)
  • doesn't allow /../ higher the root (400)
  • doesn't allow /../ or %2f%2e%2e%2f (403, WAF)
  • doesn't normalize /.., /./
  • normalizes // to /
  • %0a doesn't cut the path
  • it forwards the normalized path
  • /!"$&'()*+,-./:;<=>@[\]^_`{|}~?a#z -> /!"$&'()*+,-./:;<=>@[\]^_`{|}~?a#z
  • %01-%FF -> %01-%FF
  • strict case-sensitive list of verbs: OPTIONS,GET,HEAD,POST
  • doesn't support TRACE
  • doesn't support Max-Forwards
  • doesn't support HTTP/0.9
  • set HTTP/1.1 for the backend by default
  • doesn't allow >1 Host header
  • adds headers to the request to origin: X-Forwarded-For, x-sp-edge-host, x-sp-edge-scheme,x-fb-host, x-sp-forwarded-ip
    • in case of X-Forwarded-For, it will be added to proxy's request (examplezzz.com, example2.com)
    • doesn't allow to overide x-sp-edge-host, x-sp-edge-scheme,x-fb-host, x-sp-forwarded-ip
  • forwards headers with underscore _ in name
  • doesn't forward headers with trailing space Header :zzz
  • support line folding for headers ( Header:zzz-> it is concatenated with the previous header)
  • automatically adds Access-Control-Allow-Origin: * to all responses by default(?)

Absolute-URI

  • supports Absolute-URI with higher priority under host header
  • any scheme in Absolute-URI
  • doesn't allow @ in Absolute-URI

Fingerprint

  • Headers
Server: fbs
X-HW: 1552411092.cds068.fr8.h2,1552411092.cds028.fr8.sc,1552411092.cdn2-wafbe03-fra1.stackpath.systems.-.wx,1552411092.cds028.fr8.p
Set-Cookie: SPSI=1bf36dd5f9856283ece2beb57e430268; Path=/
Set-Cookie: spcsrf=6781b2b0cb8ad015471150714fe5e9a7; Expires=Tue, 12-Mar-19 19:19:15 GMT; Path=/; HttpOnly; SameSite=Strict
Set-Cookie: adOtr=obsvl; Expires=Thu, 2 Aug 2001 20:47:11 UTC; Path=/
Set-Cookie: UTGv2=D-h4b6fb871b7fdfabdd42b406a4db100f3671; Expires=Wed, 11-Mar-20 17:19:15 GMT; Path=/
  • 400 error
HTTP/1.1 400 Bad Request
  • 403
<h1>StackPath</h1> <hr> <h2>Sorry, you have been blocked.</h2>

Caching

  • key is normalized (without // and Absolute-URI) case-insensitive path and host (?)
  • includes query string (Standart behaviour)
  • it caches depending on extension (.zip,.js,.css,.webp,.doc,.csv,.pdf,.pls,.ls,.ppt,.ps,.class,.jar,.swf,.ejs,.fav,*.*ls,*.*ls*,.txt,.m3u8,.jpg,.jpeg,.gif,.ico,.png,.bmp,.pict,.tif,.tiff,.webp,.eps,.ttf,.eot,.woff,.woff2,.otf,.svg,.svgz,mp4,.m4a,.m4v,.mov,.ts,.wav,.mp3,.wma,.ogg,.midi,.mid)
  • it also check Content-Type for some extensions
  • doesn't cache files in Webpage root (?)
  • honors on Cache-Control from response
  • honors the Vary header from the response (default)
  • Supports Range for forwarded and cached values
  • Returns full response for 206
  • adds Expires: and Pragma: no-cache for the response which is not cached
  • Doesn't add Set-Cookie to the cached values
  • with Edge rules it's possible to cache anything (even with restrictive Cache-Control)
  • Edge rules

Caching detection

  • Doesn't cache Date header
  • 1552582220.cds081.fr8.h2,1552582220.cds063.fr8.sc,1552582220.cdn2-wafbe03-fra1.stackpath.systems.-.wx,1552582220.cds063.fr8.p or 1552582977.cds061.fr8.h2,1552582977.cds053.fr8.c
    • p Indicates the request was proxied from the origin.
    • c - Indicates the request was served from cache.