blocks|key|906170|text|试着看看http.get和response+headers。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|906171|var+http+=+require("http");

var+options+=+{
++host:+'stackoverflow.com',
++port:+80,
++path:+'/'
};

http.get(options,+function(res)+{
++console.log("Got+response:+"+%2B+res.statusCode);

++for(var+item+in+res.headers)+{
++++console.log(item+%2B+":+"+%2B+res.headers[item]);
++}
}).on('error',+function(e)+{
++console.log("Got+error:+"+%2B+e.message);
});|code-block|syntax|javascript|906172|entityMap|0|LINK|mutability|MUTABLE|url|http://nodejs.org/docs/v0.4.7/api/http.html#http.get|1|http://nodejs.org/docs/v0.4.7/api/http.html#response.headers^0|4|8|0|D|G|1|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]|$A|W|B|X|1|Y]]|C|$]]|$1|D|3|E|5|F|7|Z|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|10|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]|Q|$5|L|M|N|C|$O|R]]]]

Try to look at <a href="http://nodejs.org/docs/v0.4.7/api/http.html#http.get">http.get</a> and <a href="http://nodejs.org/docs/v0.4.7/api/http.html#response.headers">response headers</a>.

<pre><code>var http = require("http");

var options = {
 host: 'stackoverflow.com',
 port: 80,
 path: '/'
};

http.get(options, function(res) {
 console.log("Got response: " + res.statusCode);

 for(var item in res.headers) {
 console.log(item + ": " + res.headers[item]);
 }
}).on('error', function(e) {
 console.log("Got error: " + e.message);
});
</code></pre>

blocks|key|906191|text|下面的示例代码应该可以工作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|906192|var+http+=+require('http');
var+options+=+{method:+'HEAD',+host:+'stackoverflow.com',+port:+80,+path:+'/'};
var+req+=+http.request(options,+function(res)+{
++++console.log(JSON.stringify(res.headers));
++}
);
req.end();|code-block|syntax|javascript|906193|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This sample code should work:

<pre><code>var http = require('http');
var options = {method: 'HEAD', host: 'stackoverflow.com', port: 80, path: '/'};
var req = http.request(options, function(res) {
 console.log(JSON.stringify(res.headers));
 }
);
req.end();
</code></pre>

blocks|key|906260|text|使用优秀的request模块：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|906261|var+request+=+require('request');
++request("http://stackoverflow.com",+{method:+'HEAD'},+function+(err,+res,+body){
++console.log(res.headers);
});|code-block|syntax|javascript|906262|如果愿意，可以将方法更改为GET，但是如果只希望查看头部，则使用HEAD可以省去获取整个响应正文的麻烦。|906263|entityMap|0|LINK|mutability|MUTABLE|url|https://www.npmjs.org/package/request^0|5|7|5|7|0|0|0|D|3|W|4|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|F|3|G|5|H|7|10|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|11|8|@$9|12|A|13|B|C]|$9|14|A|15|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|16|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

Using the excellent <a href="https://www.npmjs.org/package/request"><code>request</code></a> module:

<pre><code>var request = require('request');
 request("http://stackoverflow.com", {method: 'HEAD'}, function (err, res, body){
 console.log(res.headers);
});
</code></pre>

You can change the method to <code>GET</code> if you wish, but using <code>HEAD</code> will save you from getting the entire response body if you only wish to look at the headers.

blocks|key|906298|text|我在使用http.get时遇到了一些问题，所以我切换到了lib+request。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|906299|var+request+=+require('request');

var+url+=+'http://blog.mynotiz.de/';

var+options+=+{
++++url:+url,
++++method:+'HEAD'
};

request(options,+function+(error,+response,+body)+{
++++++++if+(error)+{
++++++++++++return+console.error('upload+failed:',+error);
++++++++}

++++++++if+(response.headers['content-length'])+{
++++++++++++var+file_size+=+response.headers['content-length'];
++++++++++++console.log(file_size);
++++++++}
++++}
);|code-block|syntax|javascript|906300|entityMap^0|4|8|W|7|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

I had some problems with <code>http.get</code>; so I switched to the lib <code>request</code>:

<pre><code>var request = require('request');

var url = 'http://blog.mynotiz.de/';

var options = {
 url: url,
 method: 'HEAD'
};

request(options, function (error, response, body) {
 if (error) {
 return console.error('upload failed:', error);
 }

 if (response.headers['content-length']) {
 var file_size = response.headers['content-length'];
 console.log(file_size);
 }
 }
);
</code></pre>

blocks|key|906365|text|这是我的贡献，它使用http或https处理任何URL，并使用Promises。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|906366|const+http+=+require('http')
const+https+=+require('https')
const+url+=+require('url')

function+getHeaders(myURL)+{
++const+parsedURL+=+url.parse(myURL)
++const+options+=+{
++++protocol:+parsedURL.protocol,
++++hostname:+parsedURL.hostname,
++++method:+'HEAD',
++++path:+parsedURL.path
++}
++let+protocolHandler+=+(parsedURL.protocol+===+'https:'+?+https+:+http)

++return+new+Promise((resolve,+reject)+=>+{
++++let+req+=+protocolHandler.request(options,+(res)+=>+{
++++++resolve(res.headers)
++++})
++++req.on('error',+(e)+=>+{
++++++reject(e)
++++})
++++req.end()
++})
}

getHeaders(myURL).then((headers)+=>+{
++console.log(headers)
})|code-block|syntax|javascript|906367|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here is my contribution, that deals with any URL using http or https, and use Promises.

<pre><code>const http = require('http')
const https = require('https')
const url = require('url')

function getHeaders(myURL) {
 const parsedURL = url.parse(myURL)
 const options = {
 protocol: parsedURL.protocol,
 hostname: parsedURL.hostname,
 method: 'HEAD',
 path: parsedURL.path
 }
 let protocolHandler = (parsedURL.protocol === 'https:' ? https : http)

 return new Promise((resolve, reject) =&gt; {
 let req = protocolHandler.request(options, (res) =&gt; {
 resolve(res.headers)
 })
 req.on('error', (e) =&gt; {
 reject(e)
 })
 req.end()
 })
}

getHeaders(myURL).then((headers) =&gt; {
 console.log(headers)
})
</code></pre>

Is there a built in way to get the headers of a specific address via node.js?

something like,

<pre><code>var headers = getUrlHeaders("http://stackoverflow.com");
</code></pre>

would return

<pre><code>HTTP/1.1 200 OK.
Cache-Control: public, max-age=60.
Content-Type: text/html; charset=utf-8.
Content-Encoding: gzip.
Expires: Sat, 07 May 2011 17:32:38 GMT.
Last-Modified: Sat, 07 May 2011 17:31:38 GMT.
Vary: *.
Date: Sat, 07 May 2011 17:31:37 GMT.
Content-Length: 32516.
</code></pre>

Getting HTTP headers with Node.js

JSON

有没有一种内置的方法可以通过node.js获取特定地址的报头？像这样，var headers = getUrlHeaders("http://stackoverflow.com");将会返回HTTP/1.1 200 OK.Cache-Control: public, max-age=60.Content-Type: t...

问使用Node.js获取HTTP头
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