boost::urls::resolve
Resolve a URL reference against a base URL
Synopsis
Declared in header <boost/url/url_base.hpp>
system::result<void>
resolve(
const url_view_base& base,
const url_view_base& ref,
url_base& dest);Description
This function attempts to resolve a URL
reference ref against the base URL base
in a manner similar to that of a web browser
resolving an anchor tag.
The base URL must satisfy the URI grammar. In other words, it must contain a scheme.
Relative references are only usable when in the context of a base absolute URI. This process of resolving a relative reference within the context of a base URI is defined in detail in rfc3986 (see below).
The resolution process works as if the relative reference is appended to the base URI and the result is normalized.
Given the input base URL, this function resolves the relative reference as if performing the following steps:
-
Ensure the base URI has at least a scheme
-
Normalizing the reference path
-
Merge base and reference paths
-
Normalize the merged path
This function places the result of the
resolution into dest, which can be
any of the url containers that inherit
from
url_base
.
If an error occurs, the contents of
dest is unspecified and ec is set.
| Abnormal hrefs where the number of ".." segments exceeds the number of segments in the base path are handled by including the unmatched ".." segments in the result, as described in Errata 4547 . |
Example
url dest;
system::error_code ec;
resolve("/one/two/three", "four", dest, ec);
assert( dest.str() == "/one/two/four" );
resolve("http://example.com/", "/one", dest, ec);
assert( dest.str() == "http://example.com/one" );
resolve("http://example.com/one", "/two", dest, ec);
assert( dest.str() == "http://example.com/two" );
resolve("http://a/b/c/d;p?q", "g#s", dest, ec);
assert( dest.str() == "http://a/b/c/g#s" );Specification
Resolve a URL reference against a base URL
This function attempts to resolve a URL
reference ref against the base URL base
in a manner similar to that of a web browser
resolving an anchor tag.
The base URL must satisfy the URI grammar. In other words, it must contain a scheme.
Relative references are only usable when in the context of a base absolute URI. This process of resolving a relative reference within the context of a base URI is defined in detail in rfc3986 (see below).
The resolution process works as if the relative reference is appended to the base URI and the result is normalized.
Given the input base URL, this function resolves the relative reference as if performing the following steps:
-
Ensure the base URI has at least a scheme
-
Normalizing the reference path
-
Merge base and reference paths
-
Normalize the merged path
This function places the result of the
resolution into dest, which can be
any of the url containers that inherit
from
url_base
.
If an error occurs, the contents of
dest is unspecified and ec is set.
| Abnormal hrefs where the number of ".." segments exceeds the number of segments in the base path are handled by including the unmatched ".." segments in the result, as described in Errata 4547 . |
Example
url dest;
system::error_code ec;
resolve("/one/two/three", "four", dest, ec);
assert( dest.str() == "/one/two/four" );
resolve("http://example.com/", "/one", dest, ec);
assert( dest.str() == "http://example.com/one" );
resolve("http://example.com/one", "/two", dest, ec);
assert( dest.str() == "http://example.com/two" );
resolve("http://a/b/c/d;p?q", "g#s", dest, ec);
assert( dest.str() == "http://a/b/c/g#s" );