Make request.headers avoid rewriting del
statements
#290
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Similar to what happened in #74, I ran into this issue:
Which raises:
'HttpHeaders' object does not support item deletion
I guess this is probably an odd pattern but we used it to add a temporary header in a middleware that we wanted to clean at the end. I added a small change to make sure we don't rewrite in that case.
Let me know if it feels right to you.
Cheers