Bug/136

[jrconlin]

Description

bug: double amount of allowed headers

Increasing number of security headers pushed the total over the very limited 16

Testing

Attempt to send more than 16 headers for an autopush websocket request.

e.g.

echo '{"messageType":"hello","use_webpush":true}' | /usr/bin/websocat -v \
    --header="Accept: */*" \
    --header="Cache-Control: no-cache" \
    --header="Host: push.services.mozilla.com" \
    --header="Origin: wss://push.services.mozilla.com/" \
    --header="Pragma: no-cache" \
    --header="Sec-Fetch-Dest: websocket" \
    --header="Sec-Fetch-Mode: websocket" \
    --header="Sec-Fetch-Site: cross-site" \
    --header="Sec-WebSocket-Extensions: permessage-deflate" \
    --header="Sec-WebSocket-Protocol: push-notification" \
    --header="Accept-Language: en-US,en;q=0.5" \
    --header="Accept-Encoding: gzip, deflate, br" \
    --header="Jabberwocky: T'was" \
    ws://localhost:8080

Closes #136