If you had asked me to make a wild guess as to how Cloudflare stores internal headers and then removes them, I would have come up with some options:
- An entire separate dictionary or other data structure.
- One single header containing all internal metadata.
- All headers have a prefix, and the internal ones start with I and the external ones start with E.
- All internal headers start with “CFInt”.
I would not have come up with a scheme in which headers in a particular list are internal. (What if someone else uses this name? What if something forgets to sanitize? What if different simultaneously running programs disagree in the list? What if the Connection header names a Cloudflare-internal header? What if the set-difference algorithm is annoyingly slow?)
The web is already full of obnoxiously ambiguous in-band signaling and header naming, and I find it bizarre that a company with Cloudflare’s scale uses such a tedious and error-prone mechanism internally.
- An entire separate dictionary or other data structure.
- One single header containing all internal metadata.
- All headers have a prefix, and the internal ones start with I and the external ones start with E.
- All internal headers start with “CFInt”.
I would not have come up with a scheme in which headers in a particular list are internal. (What if someone else uses this name? What if something forgets to sanitize? What if different simultaneously running programs disagree in the list? What if the Connection header names a Cloudflare-internal header? What if the set-difference algorithm is annoyingly slow?)
The web is already full of obnoxiously ambiguous in-band signaling and header naming, and I find it bizarre that a company with Cloudflare’s scale uses such a tedious and error-prone mechanism internally.