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Multiple Values

We have one more bug in our implementation. To new web developers, this can come as a shock, but it's actually perfectly valid (see RFC 9110 5.2) to have multiple values for a single header key. For example:

Set-Person: lane-loves-go
Set-Person: prime-loves-zig
Set-Person: tj-loves-ocaml

Is perfectly valid. The way we should handle this case is to combine the values into a single string, separated by a comma:

Set-Person: lane-loves-go, prime-loves-zig, tj-loves-ocaml

Assignment

Add a test with a starting header that matches the header in the data to be parsed.
Update your Parse method to check if a header key already exists in the map before inserting one. If it does, append the new value to the existing value, separated by a comma.

Run and submit the CLI tests.