fetch

fetch

Fetch url contents. Supports gzipped content for quicker download, redirects (with automatic cookie handling, so no eternal redirect loops), streaming and piping etc.

Install

npm install fetch

Usage

See examples folder for a complete example

Fetch from URL

fetch.fetchUrl(url [, options], callback)

Where

• url is the url to fetch
• options is an optional options object
• callback is the callback to run - callback(error, meta, body)

Example

var fetchUrl = require("fetch").fetchUrl;

// source file is iso-8859-15 but it is converted to utf-8 automatically
fetchUrl("http://kreata.ee/iso-8859-15.php", function(error, meta, body){
    console.log(body.toString());
});

Streaming

fetch.FetchStream(url [, options]) -> Stream

Where

• url is the url to fetch
• options is an optional options object

With events:

• data with a data chunk - function(chunk){}
• meta with some information about the response function(meta){}
• end when the receiving is ready
• error

Example

var FetchStream = require("../lib/fetch").FetchStream;

var fetch = new FetchStream("http://google.com");

fetch.on("data", function(chunk){
    console.log(chunk);
});

Meta object

Meta object contains following fields:

• status
• responseHeaders
• finalUrl
• redirectCount
• cookieJar

Headers

Request headers can be set with options.headers

options = {
    headers:{
        "X-My-Header": "This is a custom header field"
    }
}

User-Agent

User-Agent value can be set with options.headers['User-Agent'] value. Defaults to "FetchStream"

options = {
    headers: {
        "User-Agent": "MyUseragent/1.0"
    }
}

Cookies

Cookies can be set with options.cookies which takes an array with cookie definitions

options = {
    cookie: ["name=value", "key=value; path=/; secure"]
}

NB Do not set cookie field directly in request header as it will be overwritten.

Cookie sharing

Cookies can be shared between different requests, this can be achieved with CookieJar

var fetch = require("./fetch");

var cookies = new fetch.CookieJar();

// add one cookie for testing
cookies.setCookie('alfa=beta; path=/;');

// create a FetchStream with custom CookieJar
var f = fetch.FetchStream("http://www.example.com/page1",{cookieJar: cookies});

f.on("end", function(){
    // if cookies were set with the previos request, the data is
    // saved in 'cookieJar' and passed to the next request
    fetch.FetchStream("http://www.example.com/page1",{cookieJar: cookies});
});

Redirects

Redirects are on by default, use options.disableRedirects to disable. Maximum redirect count can be set with options.maxRedirects (defaults to 10)

options = {
    disableRedirects: true
}

options = {
    maxRedirects: 100
}

Disable Gzip support

Gzip and Deflate support is automatically on. This is problematic in Node v0.5.9 and below since Zlib support on these versions is buggy with unpacking and tends to yield in error.

options = {
    disableGzip: true
}

Piping to file

FetchStream is a readable Stream object and thus can be piped. For example stream URL contents directly to a file:

var FetchStream = require("./fetch").FetchStream,
    fs = require("fs"),
    out;

out = fs.createWriteStream('file.html');
new FetchStream("http://www.example.com/index.php").pipe(out);

License

BSD