Nodejs URL module Operation URL related method introduction _node.js

URL Module

URL module usage is very high when processing HTTP requests because the module allows URLs to be parsed, URLs to be generated, and stitching URLs. First, let's look at a complete URL for each component.

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Href
-----------------------------------------------------------------
Host Path
--------------- ----------------------------
http://User:pass @ host.com:8080/p/a/t/h query=string #hash
-----    ---------   --------   ---- -------- ------------- -----
Protocol auth hostname Port Pathname Search Hash
------------
Query

We can use the. Parse method to convert a URL string to a URL object, as shown below.

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Url.parse (' Http://user:pass@host.com:8080/p/a/t/h?query=string#hash ');
/* =>
{protocol: ' http: ',
Auth: ' User:pass ',
Host: ' host.com:8080 ',
Port: ' 8080 ',
Hostname: ' host.com ',
Hash: ' #hash ',
Search: ' query=string ',
Query: ' query=string ',
Pathname: '/p/a/t/h ',
Path: '/p/a/t/h?query=string ',
HREF: ' Http://user:pass@host.com:8080/p/a/t/h?query=string#hash '}
*/

Pass to the. Parse method is not necessarily a complete URL, for example, in the HTTP server callback function, Request.url does not contain the protocol header and domain name, but can also be resolved using the. Parse method.

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Http.createserver (function (request, response) {
var tmp = Request.url; => "/foo/bar?a=b"
Url.parse (TMP);
/* =>
{protocol:null,
Slashes:null,
Auth:null,
Host:null,
Port:null,
Hostname:null,
Hash:null,
Search: ' A=b ',
Query: ' A=b ',
Pathname: '/foo/bar ',
Path: '/foo/bar?a=b ',
HREF: '/foo/bar?a=b '}
*/
}). Listen (80);

The. Parse method also supports optional arguments for the second and third Boolean types. When the second argument equals True, the query field in the URL object returned by the method is no longer a string, but rather a parameter object after the QueryString module has been converted. When the third argument equals True, the method correctly resolves URLs without protocol headers, such as//www.example.com/foo/bar.

In turn, the Format method allows a URL object to be converted to a URL string, as shown below.

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Url.format ({
Protocol: ' http: ',
Host: ' www.example.com ',
Pathname: '/p/a/t/h ',
Search: ' query=string '
});
/* =>
' Http://www.example.com/p/a/t/h?query=string '
*/

In addition, the. Resolve method can be used to splice URLs, as shown below.

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Url.resolve (' Http://www.example.com/foo/bar ', '. /baz ');
/* =>

Http://www.example.com/baz

*/

Query String

The QueryString module is used to convert the URL parameter string to and from the Parameter object, as shown below.

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Querystring.parse (' Foo=bar&baz=qux&baz=quux&corge ');
/* =>
{foo: ' Bar ', Baz: [' Qux ', ' Quux '], Corge: '}
*/

Querystring.stringify ({foo: ' Bar ', Baz: [' Qux ', ' Quux '], Corge: '});
/* =>
' Foo=bar&baz=qux&baz=quux&corge= '
*/