Uğur Özyılmazel — — Filed under development reading time: 1 minutes

Network Addresses and Named Ports

Network address and port information defines server service to listen on which host and port.

go’s http package provides ListenAndServe function. According to godoc:

func ListenAndServe(addr string, handler Handler) error

ListenAndServe function accepts two arguments. The first one is addr which is host:port definition. We can omit host information and define network address as ":3000".

It’s possible to use named ports. On Linux/Mac all the network services are defined under /etc/services file:

#
# Network services, Internet style
#
# WELL KNOWN PORT NUMBERS
#
rtmp              1/ddp    #Routing Table Maintenance Protocol
tcpmux            1/udp     # TCP Port Service Multiplexer
tcpmux            1/tcp     # TCP Port Service Multiplexer
#                          Mark Lottor <MKL@nisc.sri.com>
nbp               2/ddp    #Name Binding Protocol
compressnet       2/udp     # Management Utility
compressnet       2/tcp     # Management Utility
compressnet       3/udp     # Compression Process
compressnet       3/tcp     # Compression Process
#                          Bernie Volz <VOLZ@PROCESS.COM>
echo              4/ddp    #AppleTalk Echo Protocol
#                 4/tcp    Unassigned
#                 4/udp    Unassigned
rje               5/udp     # Remote Job Entry
rje               5/tcp     # Remote Job Entry
#                          Jon Postel <postel@isi.edu>
zip               6/ddp    #Zone Information Protocol
#                 6/tcp    Unassigned
#                 6/udp    Unassigned
echo              7/udp     # Echo
echo              7/tcp     # Echo
#
#
http             80/udp     www www-http # World Wide Web HTTP
http             80/tcp     www www-http # World Wide Web HTTP
#

This list goes on and on… So, you can set :http as addr argument in ListenAndServe function. Also you can use this convention almost everywhere! Enjoy named port definitions.

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