HTTP header X-fstrz

Modified on Thu, 24 Oct, 2024 at 2:05 PM

HTTP X-fstrz headers provide information on what the engine did or did not do:

p: proxy request / response
w, p: optimization in progress
f,p : front/forward, proxy
Z, p: non-optimizable page (will never be optimized, 404, 301, 302, POST, etc ...). The reason is given by another flag:
- m : method (HEAD, PROPFIND, OPTIONS, PUT, DELETE, etc)
- ecc: exclusion via the client config
- eec: exclusion via the engine config
- stc: status code of the origin different from 200
- ab: exclusion by A / B test
- zc: empty content
When no additional flags are present, the optimizations are simply disabled.
h: content that is not HTML (JSON sent with a content type text / html for example)
o: optimized
!o: not optimized
c: cached
!c: not cached
o,c: optimized, cached
w,c: response being optimized but served as cached
dc,o: optimized, dynamic cache (internal engine operation)
sc: the page is cached via SmartCache (Cache + Ajax)
clc: the page is cached via the Cookie Less Cache
pl : preload links were added to the response
ed: engine disabled
v: virtual object (result of concatenation or outlining)
vf: reconstituted virtual object
t: timeout, the optimization took too long, the returned page is not optimized
tb : too big, resource is too big to be optimized (more than 1,3Mo)
e: error, optimization failed, the returned page is not optimized
b: blocked, the IP address is blocked
ps: persistent storage
pp: partial page
pc: probabilistic cancel
ca: cancelled
wr:waiting room
uc: User Canceled, the request was canceled by the user
cbo: Circuit Breaker Open, the object is not optimized due to the temporary unavailability of an engine component
ccb: Cache CallBack, the object is served by the proxy from the cache (case of an object that has not yet been included in an A / B test)
of: Overflow, indicates that the overflow system is in place. The following flags specify the result.
- !id: no ID present
- exp: the session has expired
- !conf: no configuration found
- !en: not activated
- wen: has been activated
- in: activated
- say: disallow, the user was returned to the waiting page
- r : HTTP redirection made by Fasterize

The header x-unique-id corresponds to the unique identifier of the request (to be transmitted to the support in case of problem).