PANTHEON_STRIPPED logic breaks REST API with json format and spaced param values

[amaisano]

Lando 3.6.0
Drupal 8.9
Pantheon Recipe (PHP 7.3)
Local environment: Mac OS 12.2, Docker Desktop 3.6.0

my.web.site/page?_format=json&utm_content=My+Campaign results in a 406

Drupal's log shows this request as:

my.web.site/page?_format=json%20My%20Campaign

with no other parameters present.

Versions that DO work (200 response):

• my.web.site/page?_format=json&utm_content=Campaign (no spaces)
• my.web.site/page?_format=json&utm_c0ntent=My+Campaign (has spaces but a different spelling of "utm_content")

This does NOT affect my remote websites (dev, test, live) all work correctly given these spaced parameter values.

This only affects my local environment AFAICT.

Setting edge: false in .lando.yml prevents this problem.

[reynoldsalec]

I'm going to guess that this is something that Lando's Varnish service needs to handle, but I'm not well versed in Varnish or how Pantheon handles these types of parameters at the edge.

Since this can be resolved by setting edge: false it doesn't seem like an immediate priority (many people turn that off anyways locally because it can introduce other complexities), but would be nice to iron this out to have closer parity to Pantheon in the future.