[#boost-urls-default_port]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::default_port
:relfileprefix: ../../
:mrdocs:


Return the default port for a known scheme

== Synopsis


Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/scheme.hpp#L174[boost/url/scheme.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::uint16_t
default_port(xref:boost/urls/scheme.adoc[scheme] s) noexcept;
----

== Description


This function returns the default port    for the known schemes. If the value does    not represent a known scheme or the scheme    does not represent a protocol, the function    returns zero.

The following ports are returned by the    function:

* scheme::ftp
 = 21    
* scheme::http
, 
scheme::ws
 = 80    
* scheme::https
, 
scheme::wss
 = 443



== Return Value


An integer with the default port number



== Parameters


|===
| Name | Description

| *s*
| The known scheme constant


|===



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