JsonError needs an easy way to convert the whole thing to a string

[distinctdan]

Feature description

I'm trying to log the error when my server returns a 400. This has turned out to be difficult because JsonError doesn't have a human readable toString() function. Instead, it just returns the message and ignores all the embedded errors, which is what I actually care about. I didn't even expect to have to deal with a response object here in RequestFilter, I expected to be able get the response body as a string. I'm not sure having a response object is bad, it just makes it hard to log the response. I could serialize it, but then I'm double serializing, which is inefficient.

[ojebari-ma]

Could you please provide a reproducible example?