squid.conf

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

acl localnet src 192.168.1.0/24
http_access allow localnet

acl PURGE method PURGE
http_access allow PURGE localhost
http_access deny PURGE

http_access allow localhost
http_access allow localhost manager
http_access deny all
http_access deny CONNECT !SSL_ports
http_access deny manager
http_access deny !Safe_ports


http_port 3128  ssl-bump \
  cert=/etc/squid/ssl_cert/myCA.pem \
  generate-host-certificates=on dynamic_cert_mem_cache_size=4MB

acl step1 at_step SslBump1
ssl_bump peek step1
ssl_bump bump all

sslproxy_cafile /etc/squid/ssl_cert/myCA.pem


cache_mem 500 MB
maximum_object_size_in_memory 20240 KB

cache_dir aufs /var/cache/squid 40000 16 256

refresh_pattern codeload.github.com 900 20% 4320 reload-into-ims

refresh_pattern -i \.(pp(s|t)|wax|wm(a|v)|wmx|wpl|zip|cb(r|z|t))   129600 100% 129600  reload-into-ims

# refresh pattern for debs and udebs
refresh_pattern deb$   129600 100% 129600
refresh_pattern udeb$   129600 100% 129600
refresh_pattern tar.gz$  129600 100% 129600
refresh_pattern tar.xz$  129600 100% 129600
refresh_pattern tar.bz2$  129600 100% 129600


# always refresh Packages and Release files
refresh_pattern \/(Packages|Sources)(|\.bz2|\.gz|\.xz)$ 0 0% 0 refresh-ims
refresh_pattern \/Release(|\.gpg)$ 0 0% 0 refresh-ims
refresh_pattern \/InRelease$ 0 0% 0 refresh-ims
refresh_pattern \/(Translation-.*)(|\.bz2|\.gz|\.xz)$ 0 0% 0 refresh-ims

# handle meta-release and changelogs.ubuntu.com special
# (fine to have this on debian too)
refresh_pattern changelogs.ubuntu.com\/.*  0  1% 1


refresh_pattern .		0	20%	4320
refresh_pattern ^ftp:		1440	20%	10080
refresh_pattern ^gopher:	1440	0%	1440
refresh_pattern -i (/cgi-bin/|\?) 0	0%	0
refresh_pattern (Release|Packages(.gz)*)$      0       20%     2880

shutdown_lifetime 3 seconds
visible_hostname squid
dns_nameservers 8.8.8.8 8.8.4.4

-------------
OS :ubuntu 16.04 server
$ squid -v

Squid Cache: Version 3.5.12
Service Name: squid
Ubuntu linux
configure options:  '--build=x86_64-linux-gnu' '--prefix=/usr' '--includedir=${prefix}/include' '--mandir=${prefix}/share/man' '--infodir=${prefix}/share/info' '--sysconfdir=/etc' '--localstatedir=/var' '--libexecdir=${prefix}/lib/squid3' '--srcdir=.' '--disable-maintainer-mode' '--disable-dependency-tracking' '--disable-silent-rules' 'BUILDCXXFLAGS=-g -O2 -fPIE -fstack-protector-strong -Wformat -Werror=format-security -Wl,-Bsymbolic-functions -fPIE -pie -Wl,-z,relro -Wl,-z,now' '--datadir=/usr/share/squid' '--sysconfdir=/etc/squid' '--libexecdir=/usr/lib/squid' '--mandir=/usr/share/man' '--with-openssl' '--enable-ssl-crtd' '--enable-inline' '--disable-arch-native' '--enable-async-io=8' '--enable-storeio=ufs,aufs,diskd,rock' '--enable-removal-policies=lru,heap' '--enable-delay-pools' '--enable-cache-digests' '--enable-icap-client' '--enable-follow-x-forwarded-for' '--enable-auth-basic=DB,fake,getpwnam,LDAP,NCSA,NIS,PAM,POP3,RADIUS,SASL,SMB' '--enable-auth-digest=file,LDAP' '--enable-auth-negotiate=kerberos,wrapper' '--enable-auth-ntlm=fake,smb_lm' '--enable-external-acl-helpers=file_userip,kerberos_ldap_group,LDAP_group,session,SQL_session,unix_group,wbinfo_group' '--enable-url-rewrite-helpers=fake' '--enable-eui' '--enable-esi' '--enable-icmp' '--enable-zph-qos' '--enable-ecap' '--disable-translation' '--with-swapdir=/var/spool/squid' '--with-logdir=/var/log/squid' '--with-pidfile=/var/run/squid.pid' '--with-filedescriptors=65536' '--with-large-files' '--with-default-user=proxy' '--enable-build-info=Ubuntu linux' '--enable-linux-netfilter' 'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -fPIE -fstack-protector-strong -Wformat -Werror=format-security -Wall' 'LDFLAGS=-Wl,-Bsymbolic-functions -fPIE -pie -Wl,-z,relro -Wl,-z,now' 'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2' 'CXXFLAGS=-g -O2 -fPIE -fstack-protector-strong -Wformat -Werror=format-security'