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+/*!
+ * statuses
+ * Copyright(c) 2014 Jonathan Ong
+ * Copyright(c) 2016 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict'
+
+/**
+ * Module dependencies.
+ * @private
+ */
+
+var codes = require('./codes.json')
+
+/**
+ * Module exports.
+ * @public
+ */
+
+module.exports = status
+
+// status code to message map
+status.STATUS_CODES = codes
+
+// array of status codes
+status.codes = populateStatusesMap(status, codes)
+
+// status codes for redirects
+status.redirect = {
+ 300: true,
+ 301: true,
+ 302: true,
+ 303: true,
+ 305: true,
+ 307: true,
+ 308: true
+}
+
+// status codes for empty bodies
+status.empty = {
+ 204: true,
+ 205: true,
+ 304: true
+}
+
+// status codes for when you should retry the request
+status.retry = {
+ 502: true,
+ 503: true,
+ 504: true
+}
+
+/**
+ * Populate the statuses map for given codes.
+ * @private
+ */
+
+function populateStatusesMap (statuses, codes) {
+ var arr = []
+
+ Object.keys(codes).forEach(function forEachCode (code) {
+ var message = codes[code]
+ var status = Number(code)
+
+ // Populate properties
+ statuses[status] = message
+ statuses[message] = status
+ statuses[message.toLowerCase()] = status
+
+ // Add to array
+ arr.push(status)
+ })
+
+ return arr
+}
+
+/**
+ * Get the status code.
+ *
+ * Given a number, this will throw if it is not a known status
+ * code, otherwise the code will be returned. Given a string,
+ * the string will be parsed for a number and return the code
+ * if valid, otherwise will lookup the code assuming this is
+ * the status message.
+ *
+ * @param {string|number} code
+ * @returns {number}
+ * @public
+ */
+
+function status (code) {
+ if (typeof code === 'number') {
+ if (!status[code]) throw new Error('invalid status code: ' + code)
+ return code
+ }
+
+ if (typeof code !== 'string') {
+ throw new TypeError('code must be a number or string')
+ }
+
+ // '403'
+ var n = parseInt(code, 10)
+ if (!isNaN(n)) {
+ if (!status[n]) throw new Error('invalid status code: ' + n)
+ return n
+ }
+
+ n = status[code.toLowerCase()]
+ if (!n) throw new Error('invalid status message: "' + code + '"')
+ return n
+}