[Flask] Cannot get custom header value from request.headers

[Tom Vaughan]

Hi,

Why would this:

    print(request.headers)
    print(request.headers.get('Accept', 'No Accept'))
    print(request.headers.get('X-Real-Ip', 'No X-Real-Ip'))

cause this output:

    Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
    Connection: keep-alive
    X-Real-Ip: 172.17.0.1
    [...]

    text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
    No X-Real-Ip

?

Notice how X-Real-Ip and its value are printed when request.headers is
printed, yet the value of X-Real-Ip cannot be fetched from
requests.headers.

Thanks,
-Tom