Proxy-Authorization header not properly returned

[subnetmarco]

It seems like a recent deployment is now hiding Proxy-Authorization from the response:

curl -H "Proxy-Authorization: hello" httpbin.org/get
{
  "args": {},
  "headers": {
    "Accept": "*/*",
    "Cache-Control": "max-age=259200",
    "Host": "httpbin.org",
    "User-Agent": "curl/7.43.0",
    "Via": "1.1 roadie (squid/3.4.10)"
  },
  "origin": "10.10.33.183, 70.35.36.250",
  "url": "http://httpbin.org/get"
}

[subnetmarco]

It turns out the problem was caused by the local internet router, and not by httpbin.org