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

Identifies a known URL scheme

== Synopsis

Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/scheme.hpp#L33[boost/url/scheme.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
enum class scheme : unsigned short;
----

== Members


[cols=2]
|===
| Name
| Description
|`none`
|Indicates that no scheme is present
|`unknown`
|Indicates the scheme is not a well‐known scheme
|`ftp`
|File Transfer Protocol (FTP)
|`file`
|File URI Scheme
|`http`
|The Hypertext Transfer Protocol URI Scheme
|`https`
|The Secure Hypertext Transfer Protocol URI Scheme
|`ws`
|The WebSocket URI Scheme
|`wss`
|The Secure WebSocket URI Scheme
|===

== Non-Member Functions

[cols=2]
|===
| Name
| Description
| xref:boost/urls/default_port.adoc[`default_port`]
| Return the default port for a known scheme
| xref:boost/urls/string_to_scheme.adoc[`string_to_scheme`]
| Return the known scheme for a non‐normalized string, if known
| xref:boost/urls/to_string.adoc[`to_string`]
| Return the normalized string for a known scheme
|===

== Description

== Specification
* https://datatracker.ietf.org/doc/html/rfc3986#section-3.1[]


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