(function (Prism) {

	/**
	 * @param {string} name
	 * @returns {RegExp}
	 */
	function headerValueOf(name) {
		return RegExp('(^(?:' + name + '):[ \t]*(?![ \t]))[^]+', 'i');
	}

	Prism.languages.http = {
		'request-line': {
			pattern: /^(?:CONNECT|DELETE|GET|HEAD|OPTIONS|PATCH|POST|PRI|PUT|SEARCH|TRACE)\s(?:https?:\/\/|\/)\S*\sHTTP\/[\d.]+/m,
			inside: {
				// HTTP Method
				'method': {
					pattern: /^[A-Z]+\b/,
					alias: 'property'
				},
				// Request Target e.g. http://example.com, /path/to/file
				'request-target': {
					pattern: /^(\s)(?:https?:\/\/|\/)\S*(?=\s)/,
					lookbehind: true,
					alias: 'url',
					inside: Prism.languages.uri
				},
				// HTTP Version
				'http-version': {
					pattern: /^(\s)HTTP\/[\d.]+/,
					lookbehind: true,
					alias: 'property'
				},
			}
		},
		'response-status': {
			pattern: /^HTTP\/[\d.]+ \d+ .+/m,
			inside: {
				// HTTP Version
				'http-version': {
					pattern: /^HTTP\/[\d.]+/,
					alias: 'property'
				},
				// Status Code
				'status-code': {
					pattern: /^(\s)\d+(?=\s)/,
					lookbehind: true,
					alias: 'number'
				},
				// Reason Phrase
				'reason-phrase': {
					pattern: /^(\s).+/,
					lookbehind: true,
					alias: 'string'
				}
			}
		},
		'header': {
			pattern: /^[\w-]+:.+(?:(?:\r\n?|\n)[ \t].+)*/m,
			inside: {
				'header-value': [
					{
						pattern: headerValueOf(/Content-Security-Policy/.source),
						lookbehind: true,
						alias: ['csp', 'languages-csp'],
						inside: Prism.languages.csp
					},
					{
						pattern: headerValueOf(/Public-Key-Pins(?:-Report-Only)?/.source),
						lookbehind: true,
						alias: ['hpkp', 'languages-hpkp'],
						inside: Prism.languages.hpkp
					},
					{
						pattern: headerValueOf(/Strict-Transport-Security/.source),
						lookbehind: true,
						alias: ['hsts', 'languages-hsts'],
						inside: Prism.languages.hsts
					},
					{
						pattern: headerValueOf(/[^:]+/.source),
						lookbehind: true
					}
				],
				'header-name': {
					pattern: /^[^:]+/,
					alias: 'keyword'
				},
				'punctuation': /^:/
			}
		}
	};

	// Create a mapping of Content-Type headers to language definitions
	var langs = Prism.languages;
	var httpLanguages = {
		'application/javascript': langs.javascript,
		'application/json': langs.json || langs.javascript,
		'application/xml': langs.xml,
		'text/xml': langs.xml,
		'text/html': langs.html,
		'text/css': langs.css,
		'text/plain': langs.plain
	};

	// Declare which types can also be suffixes
	var suffixTypes = {
		'application/json': true,
		'application/xml': true
	};

	/**
	 * Returns a pattern for the given content type which matches it and any type which has it as a suffix.
	 *
	 * @param {string} contentType
	 * @returns {string}
	 */
	function getSuffixPattern(contentType) {
		var suffix = contentType.replace(/^[a-z]+\//, '');
		var suffixPattern = '\\w+/(?:[\\w.-]+\\+)+' + suffix + '(?![+\\w.-])';
		return '(?:' + contentType + '|' + suffixPattern + ')';
	}

	// Insert each content type parser that has its associated language
	// currently loaded.
	var options;
	for (var contentType in httpLanguages) {
		if (httpLanguages[contentType]) {
			options = options || {};

			var pattern = suffixTypes[contentType] ? getSuffixPattern(contentType) : contentType;
			options[contentType.replace(/\//g, '-')] = {
				pattern: RegExp(
					'(' + /content-type:\s*/.source + pattern + /(?:(?:\r\n?|\n)[\w-].*)*(?:\r(?:\n|(?!\n))|\n)/.source + ')' +
					// This is a little interesting:
					// The HTTP format spec required 1 empty line before the body to make everything unambiguous.
					// However, when writing code by hand (e.g. to display on a website) people can forget about this,
					// so we want to be liberal here. We will allow the empty line to be omitted if the first line of
					// the body does not start with a [\w-] character (as headers do).
					/[^ \t\w-][\s\S]*/.source,
					'i'
				),
				lookbehind: true,
				inside: httpLanguages[contentType]
			};
		}
	}
	if (options) {
		Prism.languages.insertBefore('http', 'header', options);
	}

}(Prism));