Chrome deprecation message

[scripting]

I'm getting this message in the JavaScript console in an app I'm working on.

[Deprecation] Resource requests whose URLs contained both removed whitespace (\n, \r, \t) characters and less-than characters (<) are blocked. Please remove newlines and encode less-than characters from places like element attribute values in order to load these resources. See https://www.chromestatus.com/feature/5735596811091968 for more details.

I don't have much info on it, but it's really weird, it's only objecting on POST messages, otherwise the requests are exactly like all the others that it's letting through.

[scripting]

The post body contained unencoded HTML, which doesn't seem like a problem to me, but I encoded it on the writing side, and decode it on the publishing side, and it works again.

I guess Chrome updated overnight? I hope so. Otherwise I have no idea why this all of a sudden stopped working. One of my least favorite things about programming on the web these days.