http-range

Node.js parser for Content-Range and Range HTTP header fields according to the HTTP/1.1 specifications.

Installation

$ npm install http-range

Usage

var ContentRange = require('http-range').ContentRange;
var Range = require('http-range').Range;
 
// Parsing and creating 'Content-Range' header
ContentRange.prototype.parse('bytes 0-49/50');  // Content-Range: bytes 0-49/50
new ContentRange('bytes', '0-49', 50).toString(); // => bytes 0-49/50
 
// Parsing and creating 'Range' header
Range.prototype.parse('bytes=0-49');  // Range: bytes=0-49
new Range('bytes', '0-49'); // => bytes=0-49

For more usages check the test files.

API

ContentRange Class

new ContentRange(unit, range, length)

• unit {String} Usually 'bytes', but can be any token
• range {RangeSpec|String} A RangeSpec instance, a string like '0-49' or '*' if unknown
• length {Number|'*'} The total length of the full entity-body or '*' if this length is unknown or difficult to determine

Throws error if arguments are invalid.

Properties

• unit {String}
• range {RangeSpec}
• length {Number|null} Null if unknown

Methods

• toString() Return a valid string value
• parse(input) Parse an input string. Throws error if invalid

Allowed Content-Range(s)

• Content-Range: bytes 0-49/50
• Content-Range: bytes 0-49/*
• Content-Range: bytes */50
• Content-Range: bytes */*

Range Class

new Range(unit, ranges)

• unit {String} Usually 'bytes', but can be any token
• ranges {RangeSpec[]|String} An array of RangeSpec instances or a string like '0-49[,50-99][...]'

Throws error if arguments are invalid.

Properties

• unit {String}
• ranges {RangeSpec[]}

Methods

• toString() Return a valid string value
• parse(input) Parse an input string. Throws error if invalid

Allowed Range(s)

• Range: bytes=0-49
• Range: bytes=0-49,50-99,-30
• Range: bytes=1-
• Range: bytes=-50

RangeSpec Class

new RangeSpec(low, high, size)

• low {Number|undefined}
• high {Number|undefined}
• size {Number|undefined} For validation only, optional

Throws error if arguments are invalid.

Properties

• low {Number|undefined}
• high {Number|undefined}

Methods

• toString() Return a valid string value
• parse(input) Parse an input string. Throws error if invalid

Examples of valid ranges

• *
• 0-49
• -49
• 34-

Tests

$ make test