Write header Proxy-Authorization before read-status-line to avoid HTTP status code 407

[muyinliu]

Tested with Squid

Squid config example:

acl localnet src 10.0.0.0/8     # RFC1918 possible internal network
acl localnet src 172.16.0.0/12  # RFC1918 possible internal network
acl localnet src 192.168.0.0/16 # RFC1918 possible internal network
acl localnet src fc00::/7       # RFC 4193 local private network range
acl localnet src fe80::/10      # RFC 4291 link-local (directly plugged) machines

acl SSL_ports port 443
acl Safe_ports port 80          # http
acl Safe_ports port 21          # ftp
acl Safe_ports port 443         # https
acl Safe_ports port 70          # gopher
acl Safe_ports port 210         # wais
acl Safe_ports port 1025-65535  # unregistered ports
acl Safe_ports port 280         # http-mgmt
acl Safe_ports port 488         # gss-http
acl Safe_ports port 591         # filemaker
acl Safe_ports port 777         # multiling http
acl CONNECT method CONNECT

http_access deny !Safe_ports

http_access deny CONNECT !SSL_ports

http_access allow localhost manager
http_access deny manager
http_access allow localnet
http_access allow localhost

# Auth config
auth_param basic program /usr/lib64/squid/basic_ncsa_auth /etc/squid/passwd
auth_param basic children 5
auth_param basic realm Squid Basic Authentication
auth_param basic credentialsttl 2 hours
acl auth_users proxy_auth REQUIRED
http_access allow auth_users

# And finally deny all other access to this proxy
http_access deny all

http_port 3128

coredump_dir /var/spool/squid

refresh_pattern ^ftp:           1440    20%     10080
refresh_pattern ^gopher:        1440    0%      1440
refresh_pattern -i (/cgi-bin/|\?) 0     0%      0
refresh_pattern .               0       20%     4320

cache deny all

add auth user:password line to file /etc/squid/passwd with command:

htpasswd -c /etc/squid/passwd username

Note: enter password & enter twice to complete.

test with drakma:

;; test proxying-https-p condition
(drakma:http-request "https://www.example.com/"
                     :proxy '("127.0.0.1" 3128)
                     :proxy-basic-authorization '("username" "password"))

;; test NOT proxying-https-p condition
(drakma:http-request "http://www.example.com/"
                     :proxy '("127.0.0.1" 3128)
                     :proxy-basic-authorization '("username" "password"))

compared curl command:

curl -v -x http://username:password@:127.0.0.1:3128 http://www.example.com
curl -v -x http://username:password@:127.0.0.1:3128 https://www.example.com

debug tools: Wireshark, filter rule: tcp.port==3128