如何使用节点http库中的发布请求上传文件? [英] How to upload file using a post request in the node http library?

问题描述

从Node.js http库文档中:

From the Node.js http library docs:

http.request() returns an instance of the http.ClientRequest class. 
The ClientRequest instance is a writable stream. If one needs to upload a file 
with a POST request, then write to the ClientRequest object.

但是我不确定如何在当前代码中利用这一点:

However I'm unsure how to leverage this in my current code:

var post_data = querystring.stringify({
    api_key: fax.api_key,
    api_secret: fax.api_secret_key,
    to: fax.fax_number,
    filename: ""
});

var options = {
    host: p_url.hostname.toString(),
    path: p_url.path.toString(),
    method: 'POST',
    headers: {
          'Content-Type': 'application/x-www-form-urlencoded',
          'Content-Length': post_data.length
    }
};

var postReq = http.request(options, function(res) {
    res.setEncoding('utf8');
    res.on('data', function (chunk) {
          console.log('Response: ' + chunk);
    });
});

postReq.write(post_data);
postReq.end();

推荐答案

由于具有可写流，因此可以在其上使用write()，end()和pipe()方法.因此，您可以打开一个资源，然后将其通过管道传递到可写流:

Since you have a writable stream, you can use the write(), end() and pipe() methods on it. Therefore, you can just open a resource, and pipe it to the writable stream:

var fs = require('fs');
var stream = fs.createReadStream('./file');
stream.pipe(postReq);

或者类似这样的东西:

var fs = require('fs');
var stream = fs.createReadStream('./file');

stream.on('data', function(data) {
  postReq.write(data);
});

stream.on('end', function() {
  postReq.end();
});

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