I like phantomjs, but it doesn't directly support getting images from webpages without requesting them separately like in casperjs. I went through QTNetworking code in the phantomjs repo until I figured out where the cache was. To use this, have all three files in the same directory. Then modify test.js for whatever you need. Call phantom js wit…

cache.js

var fs = require('fs');

//this is the path that QTNetwork classes uses for caching files for it's http client
//the path should be the one that has 16 folders labeled 0,1,2,3,...,F
exports.cachePath = '/path/to/phantomjs/cache/data/folder';

//this is the extension used for files in the cache path
exports.cacheExtension = "d";

//the resources that are to be saved
exports.cachedResources = new Array();

//call this when you first encounter a resource
//includeResource takes the httpResponse from phanomjs and remembers it for later
exports.includeResource = function (httpResponse) {
	if(!(httpResponse.url in exports.cachedResources)){
		exports.cachedResources[httpResponse.url] = new cachedResource(httpResponse);
	}
}

//this takes an httpResponse and builds the object that will be used to get the file contents
function cachedResource (httpResponse) {
	this.response = httpResponse;
	this.cacheFile = getUrlCacheFilename(this.response.url);
	this.cacheFileNoPath = this.cacheFile.clearBefore("/");
	this.mimetype = this.response.contentType.clearAfter(";");
	this.getContents = function () {
		//get all of the contents
		var contents = fs.read(exports.cachePath+this.cacheFile,'b');
		
		//get the last header
		var lastHeader = this.response.headers[this.response.headers.length-1];
		var secondToLastHeader = this.response.headers[this.response.headers.length-2];
		var indexOfLastHeader = contents.regexIndexOf(secondToLastHeader.name.escapeRegExp()+".+"+lastHeader.name.escapeRegExp());
		
		//really good chance this will be a problem with non image content types
		//I used a hex viewer to open up the QT cache files then came up with this way to find the end of the headers
		var lengthOfLastHeaders = 
			secondToLastHeader.name.length+4+secondToLastHeader.value.length+4+
			lastHeader.name.length+4+lastHeader.value.length+1;
		
		return contents.substr(indexOfLastHeader+lengthOfLastHeaders);
	}
}

//get the name of the file from the QNetworkDiskCache that phantomjs uses 
function getUrlCacheFilename(url,littleEndian,cacheSuffix)
{
	//im lazy, so make the last two args optional
	littleEndian = typeof littleEndian !== 'undefined' ? littleEndian : true;
	cacheSuffix = typeof cacheSuffix !== 'undefined' ? cacheSuffix : '.d';
   
	//convert the sha1 digest to hex
	//QT handles caching by converting the SHA1 hash to 64 bit qlonglong
	//   so the hash gets truncated to 8 bytes
	var digest = SHA1(url).substring(0,16).toString();
	
	//if this is a little endian system, reverse the bytes
	var littleEndian = true;
	if(littleEndian)
	{
		var result = "";
		//the digest is in hex, so take 2 bytes at a time
		for (var i = digest.length-1; i > 0; i-=2)
		{
			result += digest.substr(i-1, 2);
		}
		digest = result;
	}
	
	//convert to js int then to base 36 string, then truncate
	var hash = parseInt(digest,16).toString(36).substr(0, 8);
	
	//in QT the filename of a cached url is hash[0]%16 + '/' + hash + '.d'
	return (parseInt(hash.charCodeAt(hash.length-1))%16).toString(16) + '/' + hash + cacheSuffix;
}

//get hex SHA1 digest of msg
//borrowed from http://www.webtoolkit.info/javascript-sha1.html
function SHA1(msg) {
 
	function rotate_left(n,s) {
		var t4 = ( n<<s ) | (n>>>(32-s));
		return t4;
	};
 
	function lsb_hex(val) {
		var str="";
		var i;
		var vh;
		var vl;
 
		for( i=0; i<=6; i+=2 ) {
			vh = (val>>>(i*4+4))&0x0f;
			vl = (val>>>(i*4))&0x0f;
			str += vh.toString(16) + vl.toString(16);
		}
		return str;
	};
 
	function cvt_hex(val) {
		var str="";
		var i;
		var v;
 
		for( i=7; i>=0; i-- ) {
			v = (val>>>(i*4))&0x0f;
			str += v.toString(16);
		}
		return str;
	};
 
 
	function Utf8Encode(string) {
		string = string.replace(/\r\n/g,"\n");
		var utftext = "";
 
		for (var n = 0; n < string.length; n++) {
 
			var c = string.charCodeAt(n);
 
			if (c < 128) {
				utftext += String.fromCharCode(c);
			}
			else if((c > 127) && (c < 2048)) {
				utftext += String.fromCharCode((c >> 6) | 192);
				utftext += String.fromCharCode((c & 63) | 128);
			}
			else {
				utftext += String.fromCharCode((c >> 12) | 224);
				utftext += String.fromCharCode(((c >> 6) & 63) | 128);
				utftext += String.fromCharCode((c & 63) | 128);
			}
 
		}
 
		return utftext;
	};
 
	var blockstart;
	var i, j;
	var W = new Array(80);
	var H0 = 0x67452301;
	var H1 = 0xEFCDAB89;
	var H2 = 0x98BADCFE;
	var H3 = 0x10325476;
	var H4 = 0xC3D2E1F0;
	var A, B, C, D, E;
	var temp;
 
	msg = Utf8Encode(msg);
 
	var msg_len = msg.length;
 
	var word_array = new Array();
	for( i=0; i<msg_len-3; i+=4 ) {
		j = msg.charCodeAt(i)<<24 | msg.charCodeAt(i+1)<<16 |
		msg.charCodeAt(i+2)<<8 | msg.charCodeAt(i+3);
		word_array.push( j );
	}
 
	switch( msg_len % 4 ) {
		case 0:
			i = 0x080000000;
		break;
		case 1:
			i = msg.charCodeAt(msg_len-1)<<24 | 0x0800000;
		break;
 
		case 2:
			i = msg.charCodeAt(msg_len-2)<<24 | msg.charCodeAt(msg_len-1)<<16 | 0x08000;
		break;
 
		case 3:
			i = msg.charCodeAt(msg_len-3)<<24 | msg.charCodeAt(msg_len-2)<<16 | msg.charCodeAt(msg_len-1)<<8	| 0x80;
		break;
	}
 
	word_array.push( i );
 
	while( (word_array.length % 16) != 14 ) word_array.push( 0 );
 
	word_array.push( msg_len>>>29 );
	word_array.push( (msg_len<<3)&0x0ffffffff );
 
 
	for ( blockstart=0; blockstart<word_array.length; blockstart+=16 ) {
 
		for( i=0; i<16; i++ ) W[i] = word_array[blockstart+i];
		for( i=16; i<=79; i++ ) W[i] = rotate_left(W[i-3] ^ W[i-8] ^ W[i-14] ^ W[i-16], 1);
 
		A = H0;
		B = H1;
		C = H2;
		D = H3;
		E = H4;
 
		for( i= 0; i<=19; i++ ) {
			temp = (rotate_left(A,5) + ((B&C) | (~B&D)) + E + W[i] + 0x5A827999) & 0x0ffffffff;
			E = D;
			D = C;
			C = rotate_left(B,30);
			B = A;
			A = temp;
		}
 
		for( i=20; i<=39; i++ ) {
			temp = (rotate_left(A,5) + (B ^ C ^ D) + E + W[i] + 0x6ED9EBA1) & 0x0ffffffff;
			E = D;
			D = C;
			C = rotate_left(B,30);
			B = A;
			A = temp;
		}
 
		for( i=40; i<=59; i++ ) {
			temp = (rotate_left(A,5) + ((B&C) | (B&D) | (C&D)) + E + W[i] + 0x8F1BBCDC) & 0x0ffffffff;
			E = D;
			D = C;
			C = rotate_left(B,30);
			B = A;
			A = temp;
		}
 
		for( i=60; i<=79; i++ ) {
			temp = (rotate_left(A,5) + (B ^ C ^ D) + E + W[i] + 0xCA62C1D6) & 0x0ffffffff;
			E = D;
			D = C;
			C = rotate_left(B,30);
			B = A;
			A = temp;
		}
 
		H0 = (H0 + A) & 0x0ffffffff;
		H1 = (H1 + B) & 0x0ffffffff;
		H2 = (H2 + C) & 0x0ffffffff;
		H3 = (H3 + D) & 0x0ffffffff;
		H4 = (H4 + E) & 0x0ffffffff;
 
	}
 
	var temp = cvt_hex(H0) + cvt_hex(H1) + cvt_hex(H2) + cvt_hex(H3) + cvt_hex(H4);
 
	return temp.toLowerCase();
 
}

//I'm lazy, this is helpful
String.prototype.clearAfter = function(text) {
	var indexOf = this.indexOf(text);
	return (indexOf > 0) ? this.substr(0,indexOf) : this.toString();
}

String.prototype.clearBefore = function(text) {
	var indexOf = this.indexOf(text);
	return (indexOf > 0) ? this.substr(indexOf+1) : this.toString();
}


//"
String.prototype.regexIndexOf = function(regex, startpos) {
    var indexOf = this.substring(startpos || 0).search(regex);
    return (indexOf >= 0) ? (indexOf + (startpos || 0)) : indexOf;
}

//"
String.prototype.escapeRegExp = function() {
  return this.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&").replace(" ","\\s");
}

mimetype.js

exports.ext = {
	"application/andrew-inset":"ez",
	"application/applixware":"aw",
	"application/atom+xml":"atom",
	"application/atomcat+xml":"atomcat",
	"application/atomsvc+xml":"atomsvc",
	"application/ccxml+xml":"ccxml",
	"application/cdmi-capability":"cdmia",
	"application/cdmi-container":"cdmic",
	"application/cdmi-domain":"cdmid",
	"application/cdmi-object":"cdmio",
	"application/cdmi-queue":"cdmiq",
	"application/cu-seeme":"cu",
	"application/davmount+xml":"davmount",
	"application/docbook+xml":"dbk",
	"application/dssc+der":"dssc",
	"application/dssc+xml":"xdssc",
	"application/ecmascript":"ecma",
	"application/emma+xml":"emma",
	"application/epub+zip":"epub",
	"application/exi":"exi",
	"application/font-tdpfr":"pfr",
	"application/gml+xml":"gml",
	"application/gpx+xml":"gpx",
	"application/gxf":"gxf",
	"application/hyperstudio":"stk",
	"application/inkml+xml":"ink",
	"application/ipfix":"ipfix",
	"application/java-archive":"jar",
	"application/java-serialized-object":"ser",
	"application/java-vm":"class",
	"application/javascript":"js",
	"application/json":"json",
	"application/jsonml+json":"jsonml",
	"application/lost+xml":"lostxml",
	"application/mac-binhex40":"hqx",
	"application/mac-compactpro":"cpt",
	"application/mads+xml":"mads",
	"application/marc":"mrc",
	"application/marcxml+xml":"mrcx",
	"application/mathematica":"ma",
	"application/mathml+xml":"mathml",
	"application/mbox":"mbox",
	"application/mediaservercontrol+xml":"mscml",
	"application/metalink+xml":"metalink",
	"application/metalink4+xml":"meta4",
	"application/mets+xml":"mets",
	"application/mods+xml":"mods",
	"application/mp21":"m21",
	"application/mp4":"mp4s",
	"application/msword":"doc",
	"application/mxf":"mxf",
	"application/octet-stream":"bin",
	"application/oda":"oda",
	"application/oebps-package+xml":"opf",
	"application/ogg":"ogx",
	"application/omdoc+xml":"omdoc",
	"application/onenote":"onetoc",
	"application/oxps":"oxps",
	"application/patch-ops-error+xml":"xer",
	"application/pdf":"pdf",
	"application/pgp-encrypted":"pgp",
	"application/pgp-signature":"asc",
	"application/pics-rules":"prf",
	"application/pkcs10":"p10",
	"application/pkcs7-mime":"p7m",
	"application/pkcs7-signature":"p7s",
	"application/pkcs8":"p8",
	"application/pkix-attr-cert":"ac",
	"application/pkix-cert":"cer",
	"application/pkix-crl":"crl",
	"application/pkix-pkipath":"pkipath",
	"application/pkixcmp":"pki",
	"application/pls+xml":"pls",
	"application/postscript":"ai",
	"application/prs.cww":"cww",
	"application/pskc+xml":"pskcxml",
	"application/rdf+xml":"rdf",
	"application/reginfo+xml":"rif",
	"application/relax-ng-compact-syntax":"rnc",
	"application/resource-lists+xml":"rl",
	"application/resource-lists-diff+xml":"rld",
	"application/rls-services+xml":"rs",
	"application/rpki-ghostbusters":"gbr",
	"application/rpki-manifest":"mft",
	"application/rpki-roa":"roa",
	"application/rsd+xml":"rsd",
	"application/rss+xml":"rss",
	"application/rtf":"rtf",
	"application/sbml+xml":"sbml",
	"application/scvp-cv-request":"scq",
	"application/scvp-cv-response":"scs",
	"application/scvp-vp-request":"spq",
	"application/scvp-vp-response":"spp",
	"application/sdp":"sdp",
	"application/set-payment-initiation":"setpay",
	"application/set-registration-initiation":"setreg",
	"application/shf+xml":"shf",
	"application/smil+xml":"smi",
	"application/sparql-query":"rq",
	"application/sparql-results+xml":"srx",
	"application/srgs":"gram",
	"application/srgs+xml":"grxml",
	"application/sru+xml":"sru",
	"application/ssdl+xml":"ssdl",
	"application/ssml+xml":"ssml",
	"application/tei+xml":"tei",
	"application/thraud+xml":"tfi",
	"application/timestamped-data":"tsd",
	"application/vnd.3gpp.pic-bw-large":"plb",
	"application/vnd.3gpp.pic-bw-small":"psb",
	"application/vnd.3gpp.pic-bw-var":"pvb",
	"application/vnd.3gpp2.tcap":"tcap",
	"application/vnd.3m.post-it-notes":"pwn",
	"application/vnd.accpac.simply.aso":"aso",
	"application/vnd.accpac.simply.imp":"imp",
	"application/vnd.acucobol":"acu",
	"application/vnd.acucorp":"atc",
	"application/vnd.adobe.air-application-installer-package+zip":"air",
	"application/vnd.adobe.formscentral.fcdt":"fcdt",
	"application/vnd.adobe.fxp":"fxp",
	"application/vnd.adobe.xdp+xml":"xdp",
	"application/vnd.adobe.xfdf":"xfdf",
	"application/vnd.ahead.space":"ahead",
	"application/vnd.airzip.filesecure.azf":"azf",
	"application/vnd.airzip.filesecure.azs":"azs",
	"application/vnd.amazon.ebook":"azw",
	"application/vnd.americandynamics.acc":"acc",
	"application/vnd.amiga.ami":"ami",
	"application/vnd.android.package-archive":"apk",
	"application/vnd.anser-web-certificate-issue-initiation":"cii",
	"application/vnd.anser-web-funds-transfer-initiation":"fti",
	"application/vnd.antix.game-component":"atx",
	"application/vnd.apple.installer+xml":"mpkg",
	"application/vnd.apple.mpegurl":"m3u8",
	"application/vnd.aristanetworks.swi":"swi",
	"application/vnd.astraea-software.iota":"iota",
	"application/vnd.audiograph":"aep",
	"application/vnd.blueice.multipass":"mpm",
	"application/vnd.bmi":"bmi",
	"application/vnd.businessobjects":"rep",
	"application/vnd.chemdraw+xml":"cdxml",
	"application/vnd.chipnuts.karaoke-mmd":"mmd",
	"application/vnd.cinderella":"cdy",
	"application/vnd.claymore":"cla",
	"application/vnd.cloanto.rp9":"rp9",
	"application/vnd.clonk.c4group":"c4g",
	"application/vnd.cluetrust.cartomobile-config":"c11amc",
	"application/vnd.cluetrust.cartomobile-config-pkg":"c11amz",
	"application/vnd.commonspace":"csp",
	"application/vnd.contact.cmsg":"cdbcmsg",
	"application/vnd.cosmocaller":"cmc",
	"application/vnd.crick.clicker":"clkx",
	"application/vnd.crick.clicker.keyboard":"clkk",
	"application/vnd.crick.clicker.palette":"clkp",
	"application/vnd.crick.clicker.template":"clkt",
	"application/vnd.crick.clicker.wordbank":"clkw",
	"application/vnd.criticaltools.wbs+xml":"wbs",
	"application/vnd.ctc-posml":"pml",
	"application/vnd.cups-ppd":"ppd",
	"application/vnd.curl.car":"car",
	"application/vnd.curl.pcurl":"pcurl",
	"application/vnd.dart":"dart",
	"application/vnd.data-vision.rdz":"rdz",
	"application/vnd.dece.data":"uvf",
	"application/vnd.dece.ttml+xml":"uvt",
	"application/vnd.dece.unspecified":"uvx",
	"application/vnd.dece.zip":"uvz",
	"application/vnd.denovo.fcselayout-link":"fe",
	"application/vnd.dna":"dna",
	"application/vnd.dolby.mlp":"mlp",
	"application/vnd.dpgraph":"dpg",
	"application/vnd.dreamfactory":"dfac",
	"application/vnd.ds-keypoint":"kpxx",
	"application/vnd.dvb.ait":"ait",
	"application/vnd.dvb.service":"svc",
	"application/vnd.dynageo":"geo",
	"application/vnd.ecowin.chart":"mag",
	"application/vnd.enliven":"nml",
	"application/vnd.epson.esf":"esf",
	"application/vnd.epson.msf":"msf",
	"application/vnd.epson.quickanime":"qam",
	"application/vnd.epson.salt":"slt",
	"application/vnd.epson.ssf":"ssf",
	"application/vnd.eszigno3+xml":"es3",
	"application/vnd.ezpix-album":"ez2",
	"application/vnd.ezpix-package":"ez3",
	"application/vnd.fdf":"fdf",
	"application/vnd.fdsn.mseed":"mseed",
	"application/vnd.fdsn.seed":"seed",
	"application/vnd.flographit":"gph",
	"application/vnd.fluxtime.clip":"ftc",
	"application/vnd.framemaker":"fm",
	"application/vnd.frogans.fnc":"fnc",
	"application/vnd.frogans.ltf":"ltf",
	"application/vnd.fsc.weblaunch":"fsc",
	"application/vnd.fujitsu.oasys":"oas",
	"application/vnd.fujitsu.oasys2":"oa2",
	"application/vnd.fujitsu.oasys3":"oa3",
	"application/vnd.fujitsu.oasysgp":"fg5",
	"application/vnd.fujitsu.oasysprs":"bh2",
	"application/vnd.fujixerox.ddd":"ddd",
	"application/vnd.fujixerox.docuworks":"xdw",
	"application/vnd.fujixerox.docuworks.binder":"xbd",
	"application/vnd.fuzzysheet":"fzs",
	"application/vnd.genomatix.tuxedo":"txd",
	"application/vnd.geogebra.file":"ggb",
	"application/vnd.geogebra.tool":"ggt",
	"application/vnd.geometry-explorer":"gex",
	"application/vnd.geonext":"gxt",
	"application/vnd.geoplan":"g2w",
	"application/vnd.geospace":"g3w",
	"application/vnd.gmx":"gmx",
	"application/vnd.google-earth.kml+xml":"kml",
	"application/vnd.google-earth.kmz":"kmz",
	"application/vnd.grafeq":"gqf",
	"application/vnd.groove-account":"gac",
	"application/vnd.groove-help":"ghf",
	"application/vnd.groove-identity-message":"gim",
	"application/vnd.groove-injector":"grv",
	"application/vnd.groove-tool-message":"gtm",
	"application/vnd.groove-tool-template":"tpl",
	"application/vnd.groove-vcard":"vcg",
	"application/vnd.hal+xml":"hal",
	"application/vnd.handheld-entertainment+xml":"zmm",
	"application/vnd.hbci":"hbci",
	"application/vnd.hhe.lesson-player":"les",
	"application/vnd.hp-hpgl":"hpgl",
	"application/vnd.hp-hpid":"hpid",
	"application/vnd.hp-hps":"hps",
	"application/vnd.hp-jlyt":"jlt",
	"application/vnd.hp-pcl":"pcl",
	"application/vnd.hp-pclxl":"pclxl",
	"application/vnd.hydrostatix.sof-data":"sfd",
	"application/vnd.ibm.minipay":"mpy",
	"application/vnd.ibm.modcap":"afp",
	"application/vnd.ibm.rights-management":"irm",
	"application/vnd.ibm.secure-container":"sc",
	"application/vnd.iccprofile":"icc",
	"application/vnd.igloader":"igl",
	"application/vnd.immervision-ivp":"ivp",
	"application/vnd.immervision-ivu":"ivu",
	"application/vnd.insors.igm":"igm",
	"application/vnd.intercon.formnet":"xpw",
	"application/vnd.intergeo":"i2g",
	"application/vnd.intu.qbo":"qbo",
	"application/vnd.intu.qfx":"qfx",
	"application/vnd.ipunplugged.rcprofile":"rcprofile",
	"application/vnd.irepository.package+xml":"irp",
	"application/vnd.is-xpr":"xpr",
	"application/vnd.isac.fcs":"fcs",
	"application/vnd.jam":"jam",
	"application/vnd.jcp.javame.midlet-rms":"rms",
	"application/vnd.jisp":"jisp",
	"application/vnd.joost.joda-archive":"joda",
	"application/vnd.kahootz":"ktz",
	"application/vnd.kde.karbon":"karbon",
	"application/vnd.kde.kchart":"chrt",
	"application/vnd.kde.kformula":"kfo",
	"application/vnd.kde.kivio":"flw",
	"application/vnd.kde.kontour":"kon",
	"application/vnd.kde.kpresenter":"kpr",
	"application/vnd.kde.kspread":"ksp",
	"application/vnd.kde.kword":"kwd",
	"application/vnd.kenameaapp":"htke",
	"application/vnd.kidspiration":"kia",
	"application/vnd.kinar":"kne",
	"application/vnd.koan":"skp",
	"application/vnd.kodak-descriptor":"sse",
	"application/vnd.las.las+xml":"lasxml",
	"application/vnd.llamagraphics.life-balance.desktop":"lbd",
	"application/vnd.llamagraphics.life-balance.exchange+xml":"lbe",
	"application/vnd.lotus-1-2-3":"123",
	"application/vnd.lotus-approach":"apr",
	"application/vnd.lotus-freelance":"pre",
	"application/vnd.lotus-notes":"nsf",
	"application/vnd.lotus-organizer":"org",
	"application/vnd.lotus-screencam":"scm",
	"application/vnd.lotus-wordpro":"lwp",
	"application/vnd.macports.portpkg":"portpkg",
	"application/vnd.mcd":"mcd",
	"application/vnd.medcalcdata":"mc1",
	"application/vnd.mediastation.cdkey":"cdkey",
	"application/vnd.mfer":"mwf",
	"application/vnd.mfmp":"mfm",
	"application/vnd.micrografx.flo":"flo",
	"application/vnd.micrografx.igx":"igx",
	"application/vnd.mif":"mif",
	"application/vnd.mobius.daf":"daf",
	"application/vnd.mobius.dis":"dis",
	"application/vnd.mobius.mbk":"mbk",
	"application/vnd.mobius.mqy":"mqy",
	"application/vnd.mobius.msl":"msl",
	"application/vnd.mobius.plc":"plc",
	"application/vnd.mobius.txf":"txf",
	"application/vnd.mophun.application":"mpn",
	"application/vnd.mophun.certificate":"mpc",
	"application/vnd.mozilla.xul+xml":"xul",
	"application/vnd.ms-artgalry":"cil",
	"application/vnd.ms-cab-compressed":"cab",
	"application/vnd.ms-excel":"xls",
	"application/vnd.ms-excel.addin.macroenabled.12":"xlam",
	"application/vnd.ms-excel.sheet.binary.macroenabled.12":"xlsb",
	"application/vnd.ms-excel.sheet.macroenabled.12":"xlsm",
	"application/vnd.ms-excel.template.macroenabled.12":"xltm",
	"application/vnd.ms-fontobject":"eot",
	"application/vnd.ms-htmlhelp":"chm",
	"application/vnd.ms-ims":"ims",
	"application/vnd.ms-lrm":"lrm",
	"application/vnd.ms-officetheme":"thmx",
	"application/vnd.ms-pki.seccat":"cat",
	"application/vnd.ms-pki.stl":"stl",
	"application/vnd.ms-powerpoint":"ppt",
	"application/vnd.ms-powerpoint.addin.macroenabled.12":"ppam",
	"application/vnd.ms-powerpoint.presentation.macroenabled.12":"pptm",
	"application/vnd.ms-powerpoint.slide.macroenabled.12":"sldm",
	"application/vnd.ms-powerpoint.slideshow.macroenabled.12":"ppsm",
	"application/vnd.ms-powerpoint.template.macroenabled.12":"potm",
	"application/vnd.ms-project":"mpp",
	"application/vnd.ms-word.document.macroenabled.12":"docm",
	"application/vnd.ms-word.template.macroenabled.12":"dotm",
	"application/vnd.ms-works":"wps",
	"application/vnd.ms-wpl":"wpl",
	"application/vnd.ms-xpsdocument":"xps",
	"application/vnd.mseq":"mseq",
	"application/vnd.musician":"mus",
	"application/vnd.muvee.style":"msty",
	"application/vnd.mynfc":"taglet",
	"application/vnd.neurolanguage.nlu":"nlu",
	"application/vnd.nitf":"ntf",
	"application/vnd.noblenet-directory":"nnd",
	"application/vnd.noblenet-sealer":"nns",
	"application/vnd.noblenet-web":"nnw",
	"application/vnd.nokia.n-gage.data":"ngdat",
	"application/vnd.nokia.n-gage.symbian.install":"n",
	"application/vnd.nokia.radio-preset":"rpst",
	"application/vnd.nokia.radio-presets":"rpss",
	"application/vnd.novadigm.edm":"edm",
	"application/vnd.novadigm.edx":"edx",
	"application/vnd.novadigm.ext":"ext",
	"application/vnd.oasis.opendocument.chart":"odc",
	"application/vnd.oasis.opendocument.chart-template":"otc",
	"application/vnd.oasis.opendocument.database":"odb",
	"application/vnd.oasis.opendocument.formula":"odf",
	"application/vnd.oasis.opendocument.formula-template":"odft",
	"application/vnd.oasis.opendocument.graphics":"odg",
	"application/vnd.oasis.opendocument.graphics-template":"otg",
	"application/vnd.oasis.opendocument.image":"odi",
	"application/vnd.oasis.opendocument.image-template":"oti",
	"application/vnd.oasis.opendocument.presentation":"odp",
	"application/vnd.oasis.opendocument.presentation-template":"otp",
	"application/vnd.oasis.opendocument.spreadsheet":"ods",
	"application/vnd.oasis.opendocument.spreadsheet-template":"ots",
	"application/vnd.oasis.opendocument.text":"odt",
	"application/vnd.oasis.opendocument.text-master":"odm",
	"application/vnd.oasis.opendocument.text-template":"ott",
	"application/vnd.oasis.opendocument.text-web":"oth",
	"application/vnd.olpc-sugar":"xo",
	"application/vnd.oma.dd2+xml":"dd2",
	"application/vnd.openofficeorg.extension":"oxt",
	"application/vnd.openxmlformats-officedocument.presentationml.presentation":"pptx",
	"application/vnd.openxmlformats-officedocument.presentationml.slide":"sldx",
	"application/vnd.openxmlformats-officedocument.presentationml.slideshow":"ppsx",
	"application/vnd.openxmlformats-officedocument.presentationml.template":"potx",
	"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet":"xlsx",
	"application/vnd.openxmlformats-officedocument.spreadsheetml.template":"xltx",
	"application/vnd.openxmlformats-officedocument.wordprocessingml.document":"docx",
	"application/vnd.openxmlformats-officedocument.wordprocessingml.template":"dotx",
	"application/vnd.osgeo.mapguide.package":"mgp",
	"application/vnd.osgi.dp":"dp",
	"application/vnd.osgi.subsystem":"esa",
	"application/vnd.palm":"pdb",
	"application/vnd.pawaafile":"paw",
	"application/vnd.pg.format":"str",
	"application/vnd.pg.osasli":"ei6",
	"application/vnd.picsel":"efif",
	"application/vnd.pmi.widget":"wg",
	"application/vnd.pocketlearn":"plf",
	"application/vnd.powerbuilder6":"pbd",
	"application/vnd.previewsystems.box":"box",
	"application/vnd.proteus.magazine":"mgz",
	"application/vnd.publishare-delta-tree":"qps",
	"application/vnd.pvi.ptid1":"ptid",
	"application/vnd.quark.quarkxpress":"qxd",
	"application/vnd.realvnc.bed":"bed",
	"application/vnd.recordare.musicxml":"mxl",
	"application/vnd.recordare.musicxml+xml":"musicxml",
	"application/vnd.rig.cryptonote":"cryptonote",
	"application/vnd.rim.cod":"cod",
	"application/vnd.rn-realmedia":"rm",
	"application/vnd.rn-realmedia-vbr":"rmvb",
	"application/vnd.route66.link66+xml":"link66",
	"application/vnd.sailingtracker.track":"st",
	"application/vnd.seemail":"see",
	"application/vnd.sema":"sema",
	"application/vnd.semd":"semd",
	"application/vnd.semf":"semf",
	"application/vnd.shana.informed.formdata":"ifm",
	"application/vnd.shana.informed.formtemplate":"itp",
	"application/vnd.shana.informed.interchange":"iif",
	"application/vnd.shana.informed.package":"ipk",
	"application/vnd.simtech-mindmapper":"twd",
	"application/vnd.smaf":"mmf",
	"application/vnd.smart.teacher":"teacher",
	"application/vnd.solent.sdkm+xml":"sdkm",
	"application/vnd.spotfire.dxp":"dxp",
	"application/vnd.spotfire.sfs":"sfs",
	"application/vnd.stardivision.calc":"sdc",
	"application/vnd.stardivision.draw":"sda",
	"application/vnd.stardivision.impress":"sdd",
	"application/vnd.stardivision.math":"smf",
	"application/vnd.stardivision.writer":"sdw",
	"application/vnd.stardivision.writer-global":"sgl",
	"application/vnd.stepmania.package":"smzip",
	"application/vnd.stepmania.stepchart":"sm",
	"application/vnd.sun.xml.calc":"sxc",
	"application/vnd.sun.xml.calc.template":"stc",
	"application/vnd.sun.xml.draw":"sxd",
	"application/vnd.sun.xml.draw.template":"std",
	"application/vnd.sun.xml.impress":"sxi",
	"application/vnd.sun.xml.impress.template":"sti",
	"application/vnd.sun.xml.math":"sxm",
	"application/vnd.sun.xml.writer":"sxw",
	"application/vnd.sun.xml.writer.global":"sxg",
	"application/vnd.sun.xml.writer.template":"stw",
	"application/vnd.sus-calendar":"sus",
	"application/vnd.svd":"svd",
	"application/vnd.symbian.install":"sis",
	"application/vnd.syncml+xml":"xsm",
	"application/vnd.syncml.dm+wbxml":"bdm",
	"application/vnd.syncml.dm+xml":"xdm",
	"application/vnd.tao.intent-module-archive":"tao",
	"application/vnd.tcpdump.pcap":"pcap",
	"application/vnd.tmobile-livetv":"tmo",
	"application/vnd.trid.tpt":"tpt",
	"application/vnd.triscape.mxs":"mxs",
	"application/vnd.trueapp":"tra",
	"application/vnd.ufdl":"ufd",
	"application/vnd.uiq.theme":"utz",
	"application/vnd.umajin":"umj",
	"application/vnd.unity":"unityweb",
	"application/vnd.uoml+xml":"uoml",
	"application/vnd.vcx":"vcx",
	"application/vnd.visio":"vsd",
	"application/vnd.visionary":"vis",
	"application/vnd.vsf":"vsf",
	"application/vnd.wap.wbxml":"wbxml",
	"application/vnd.wap.wmlc":"wmlc",
	"application/vnd.wap.wmlscriptc":"wmlsc",
	"application/vnd.webturbo":"wtb",
	"application/vnd.wolfram.player":"nbp",
	"application/vnd.wordperfect":"wpd",
	"application/vnd.wqd":"wqd",
	"application/vnd.wt.stf":"stf",
	"application/vnd.xara":"xar",
	"application/vnd.xfdl":"xfdl",
	"application/vnd.yamaha.hv-dic":"hvd",
	"application/vnd.yamaha.hv-script":"hvs",
	"application/vnd.yamaha.hv-voice":"hvp",
	"application/vnd.yamaha.openscoreformat":"osf",
	"application/vnd.yamaha.openscoreformat.osfpvg+xml":"osfpvg",
	"application/vnd.yamaha.smaf-audio":"saf",
	"application/vnd.yamaha.smaf-phrase":"spf",
	"application/vnd.yellowriver-custom-menu":"cmp",
	"application/vnd.zul":"zir",
	"application/vnd.zzazz.deck+xml":"zaz",
	"application/voicexml+xml":"vxml",
	"application/widget":"wgt",
	"application/winhlp":"hlp",
	"application/wsdl+xml":"wsdl",
	"application/wspolicy+xml":"wspolicy",
	"application/x-7z-compressed":"7z",
	"application/x-abiword":"abw",
	"application/x-ace-compressed":"ace",
	"application/x-apple-diskimage":"dmg",
	"application/x-authorware-bin":"aab",
	"application/x-authorware-map":"aam",
	"application/x-authorware-seg":"aas",
	"application/x-bcpio":"bcpio",
	"application/x-bittorrent":"torrent",
	"application/x-blorb":"blb",
	"application/x-bzip":"bz",
	"application/x-bzip2":"bz2",
	"application/x-cbr":"cbr",
	"application/x-cdlink":"vcd",
	"application/x-cfs-compressed":"cfs",
	"application/x-chat":"chat",
	"application/x-chess-pgn":"pgn",
	"application/x-conference":"nsc",
	"application/x-cpio":"cpio",
	"application/x-csh":"csh",
	"application/x-debian-package":"deb",
	"application/x-dgc-compressed":"dgc",
	"application/x-director":"dir",
	"application/x-doom":"wad",
	"application/x-dtbncx+xml":"ncx",
	"application/x-dtbook+xml":"dtb",
	"application/x-dtbresource+xml":"res",
	"application/x-dvi":"dvi",
	"application/x-envoy":"evy",
	"application/x-eva":"eva",
	"application/x-font-bdf":"bdf",
	"application/x-font-ghostscript":"gsf",
	"application/x-font-linux-psf":"psf",
	"application/x-font-otf":"otf",
	"application/x-font-pcf":"pcf",
	"application/x-font-snf":"snf",
	"application/x-font-ttf":"ttf",
	"application/x-font-type1":"pfa",
	"application/x-font-woff":"woff",
	"application/x-freearc":"arc",
	"application/x-futuresplash":"spl",
	"application/x-gca-compressed":"gca",
	"application/x-glulx":"ulx",
	"application/x-gnumeric":"gnumeric",
	"application/x-gramps-xml":"gramps",
	"application/x-gtar":"gtar",
	"application/x-hdf":"hdf",
	"application/x-install-instructions":"install",
	"application/x-iso9660-image":"iso",
	"application/x-java-jnlp-file":"jnlp",
	"application/x-latex":"latex",
	"application/x-lzh-compressed":"lzh",
	"application/x-mie":"mie",
	"application/x-mobipocket-ebook":"prc",
	"application/x-ms-application":"application",
	"application/x-ms-shortcut":"lnk",
	"application/x-ms-wmd":"wmd",
	"application/x-ms-wmz":"wmz",
	"application/x-ms-xbap":"xbap",
	"application/x-msaccess":"mdb",
	"application/x-msbinder":"obd",
	"application/x-mscardfile":"crd",
	"application/x-msclip":"clp",
	"application/x-msdownload":"exe",
	"application/x-msmediaview":"mvb",
	"application/x-msmetafile":"wmf",
	"application/x-msmoney":"mny",
	"application/x-mspublisher":"pub",
	"application/x-msschedule":"scd",
	"application/x-msterminal":"trm",
	"application/x-mswrite":"wri",
	"application/x-netcdf":"nc",
	"application/x-nzb":"nzb",
	"application/x-pkcs12":"p12",
	"application/x-pkcs7-certificates":"p7b",
	"application/x-pkcs7-certreqresp":"p7r",
	"application/x-rar-compressed":"rar",
	"application/x-research-info-systems":"ris",
	"application/x-sh":"sh",
	"application/x-shar":"shar",
	"application/x-shockwave-flash":"swf",
	"application/x-silverlight-app":"xap",
	"application/x-sql":"sql",
	"application/x-stuffit":"sit",
	"application/x-stuffitx":"sitx",
	"application/x-subrip":"srt",
	"application/x-sv4cpio":"sv4cpio",
	"application/x-sv4crc":"sv4crc",
	"application/x-t3vm-image":"t3",
	"application/x-tads":"gam",
	"application/x-tar":"tar",
	"application/x-tcl":"tcl",
	"application/x-tex":"tex",
	"application/x-tex-tfm":"tfm",
	"application/x-texinfo":"texinfo",
	"application/x-tgif":"obj",
	"application/x-ustar":"ustar",
	"application/x-wais-source":"src",
	"application/x-x509-ca-cert":"der",
	"application/x-xfig":"fig",
	"application/x-xliff+xml":"xlf",
	"application/x-xpinstall":"xpi",
	"application/x-xz":"xz",
	"application/x-zmachine":"z1",
	"application/xaml+xml":"xaml",
	"application/xcap-diff+xml":"xdf",
	"application/xenc+xml":"xenc",
	"application/xhtml+xml":"xhtml",
	"application/xml":"xml",
	"application/xml-dtd":"dtd",
	"application/xop+xml":"xop",
	"application/xproc+xml":"xpl",
	"application/xslt+xml":"xslt",
	"application/xspf+xml":"xspf",
	"application/xv+xml":"mxml",
	"application/yang":"yang",
	"application/yin+xml":"yin",
	"application/zip":"zip",
	"audio/adpcm":"adp",
	"audio/basic":"au",
	"audio/midi":"mid",
	"audio/mp4":"mp4a",
	"audio/mpeg":"mpga",
	"audio/ogg":"oga",
	"audio/s3m":"s3m",
	"audio/silk":"sil",
	"audio/vnd.dece.audio":"uva",
	"audio/vnd.digital-winds":"eol",
	"audio/vnd.dra":"dra",
	"audio/vnd.dts":"dts",
	"audio/vnd.dts.hd":"dtshd",
	"audio/vnd.lucent.voice":"lvp",
	"audio/vnd.ms-playready.media.pya":"pya",
	"audio/vnd.nuera.ecelp4800":"ecelp4800",
	"audio/vnd.nuera.ecelp7470":"ecelp7470",
	"audio/vnd.nuera.ecelp9600":"ecelp9600",
	"audio/vnd.rip":"rip",
	"audio/webm":"weba",
	"audio/x-aac":"aac",
	"audio/x-aiff":"aif",
	"audio/x-caf":"caf",
	"audio/x-flac":"flac",
	"audio/x-matroska":"mka",
	"audio/x-mpegurl":"m3u",
	"audio/x-ms-wax":"wax",
	"audio/x-ms-wma":"wma",
	"audio/x-pn-realaudio":"ram",
	"audio/x-pn-realaudio-plugin":"rmp",
	"audio/x-wav":"wav",
	"audio/xm":"xm",
	"chemical/x-cdx":"cdx",
	"chemical/x-cif":"cif",
	"chemical/x-cmdf":"cmdf",
	"chemical/x-cml":"cml",
	"chemical/x-csml":"csml",
	"chemical/x-xyz":"xyz",
	"image/bmp":"bmp",
	"image/cgm":"cgm",
	"image/g3fax":"g3",
	"image/gif":"gif",
	"image/ief":"ief",
	"image/jpeg":"jpeg",
	"image/ktx":"ktx",
	"image/png":"png",
	"image/prs.btif":"btif",
	"image/sgi":"sgi",
	"image/svg+xml":"svg",
	"image/tiff":"tiff",
	"image/vnd.adobe.photoshop":"psd",
	"image/vnd.dece.graphic":"uvi",
	"image/vnd.dvb.subtitle":"sub",
	"image/vnd.djvu":"djvu",
	"image/vnd.dwg":"dwg",
	"image/vnd.dxf":"dxf",
	"image/vnd.fastbidsheet":"fbs",
	"image/vnd.fpx":"fpx",
	"image/vnd.fst":"fst",
	"image/vnd.fujixerox.edmics-mmr":"mmr",
	"image/vnd.fujixerox.edmics-rlc":"rlc",
	"image/vnd.ms-modi":"mdi",
	"image/vnd.ms-photo":"wdp",
	"image/vnd.net-fpx":"npx",
	"image/vnd.wap.wbmp":"wbmp",
	"image/vnd.xiff":"xif",
	"image/webp":"webp",
	"image/x-3ds":"3ds",
	"image/x-cmu-raster":"ras",
	"image/x-cmx":"cmx",
	"image/x-freehand":"fh",
	"image/x-icon":"ico",
	"image/x-mrsid-image":"sid",
	"image/x-pcx":"pcx",
	"image/x-pict":"pic",
	"image/x-portable-anymap":"pnm",
	"image/x-portable-bitmap":"pbm",
	"image/x-portable-graymap":"pgm",
	"image/x-portable-pixmap":"ppm",
	"image/x-rgb":"rgb",
	"image/x-tga":"tga",
	"image/x-xbitmap":"xbm",
	"image/x-xpixmap":"xpm",
	"image/x-xwindowdump":"xwd",
	"message/rfc822":"eml",
	"model/iges":"igs",
	"model/mesh":"msh",
	"model/vnd.collada+xml":"dae",
	"model/vnd.dwf":"dwf",
	"model/vnd.gdl":"gdl",
	"model/vnd.gtw":"gtw",
	"model/vnd.mts":"mts",
	"model/vnd.vtu":"vtu",
	"model/vrml":"wrl",
	"model/x3d+binary":"x3db",
	"model/x3d+vrml":"x3dv",
	"model/x3d+xml":"x3d",
	"text/cache-manifest":"appcache",
	"text/calendar":"ics",
	"text/css":"css",
	"text/csv":"csv",
	"text/javascript":"js",
	"text/html":"html",
	"text/n3":"n3",
	"text/plain":"txt",
	"text/prs.lines.tag":"dsc",
	"text/richtext":"rtx",
	"text/sgml":"sgml",
	"text/tab-separated-values":"tsv",
	"text/troff":"t",
	"text/turtle":"ttl",
	"text/uri-list":"uri",
	"text/vcard":"vcard",
	"text/vnd.curl":"curl",
	"text/vnd.curl.dcurl":"dcurl",
	"text/vnd.curl.scurl":"scurl",
	"text/vnd.curl.mcurl":"mcurl",
	"text/vnd.dvb.subtitle":"sub",
	"text/vnd.fly":"fly",
	"text/vnd.fmi.flexstor":"flx",
	"text/vnd.graphviz":"gv",
	"text/vnd.in3d.3dml":"3dml",
	"text/vnd.in3d.spot":"spot",
	"text/vnd.sun.j2me.app-descriptor":"jad",
	"text/vnd.wap.wml":"wml",
	"text/vnd.wap.wmlscript":"wmls",
	"text/x-asm":"s",
	"text/x-c":"c",
	"text/x-fortran":"f",
	"text/x-java-source":"java",
	"text/x-opml":"opml",
	"text/x-pascal":"p",
	"text/x-nfo":"nfo",
	"text/x-setext":"etx",
	"text/x-sfv":"sfv",
	"text/x-uuencode":"uu",
	"text/x-vcalendar":"vcs",
	"text/x-vcard":"vcf",
	"video/3gpp":"3gp",
	"video/3gpp2":"3g2",
	"video/h261":"h261",
	"video/h263":"h263",
	"video/h264":"h264",
	"video/jpeg":"jpgv",
	"video/jpm":"jpm",
	"video/mj2":"mj2",
	"video/mp4":"mp4",
	"video/mpeg":"mpeg",
	"video/ogg":"ogv",
	"video/quicktime":"qt",
	"video/vnd.dece.hd":"uvh",
	"video/vnd.dece.mobile":"uvm",
	"video/vnd.dece.pd":"uvp",
	"video/vnd.dece.sd":"uvs",
	"video/vnd.dece.video":"uvv",
	"video/vnd.dvb.file":"dvb",
	"video/vnd.fvt":"fvt",
	"video/vnd.mpegurl":"mxu",
	"video/vnd.ms-playready.media.pyv":"pyv",
	"video/vnd.uvvu.mp4":"uvu",
	"video/vnd.vivo":"viv",
	"video/webm":"webm",
	"video/x-f4v":"f4v",
	"video/x-fli":"fli",
	"video/x-flv":"flv",
	"video/x-m4v":"m4v",
	"video/x-matroska":"mkv",
	"video/x-mng":"mng",
	"video/x-ms-asf":"asf",
	"video/x-ms-vob":"vob",
	"video/x-ms-wm":"wm",
	"video/x-ms-wmv":"wmv",
	"video/x-ms-wmx":"wmx",
	"video/x-ms-wvx":"wvx",
	"video/x-msvideo":"avi",
	"video/x-sgi-movie":"movie",
	"video/x-smv":"smv",
	"x-conference/x-cooltalk":"ice"
};

test.js

//for this to work, you have to call phantomjs with the cache enabled:
//usage:  phantomjs --disk-cache=true test.js

var page = require('webpage').create();
var fs = require('fs');
var cache = require('./cache');
var mimetype = require('./mimetype');

//this is the path that QTNetwork classes uses for caching files for it's http client
//the path should be the one that has 16 folders labeled 0,1,2,3,...,F
cache.cachePath = '/Users/brandon/Library/Caches/Ofi Labs/PhantomJS/data7/';

var url = 'http://google.com';
page.viewportSize = { width: 1300, height: 768 };

//when the resource is received, go ahead and include a reference to it in the cache object
page.onResourceReceived = function(response) {
  //I only cache images, but you can change this
	if(response.contentType.indexOf('image') >= 0)
	{
		cache.includeResource(response);
	}
};

//when the page is done loading, go through each cachedResource and do something with it, 
//I'm just saving them to a file
page.onLoadFinished = function(status) {
	for(index in cache.cachedResources) {
		var file = cache.cachedResources[index].cacheFileNoPath;
		var ext = mimetype.ext[cache.cachedResources[index].mimetype];
		var finalFile = file.replace("."+cache.cacheExtension,"."+ext);
		fs.write('saved/'+finalFile,cache.cachedResources[index].getContents(),'b');
	}
};

page.open(url, function () {
    page.render('saved/google.pdf');
    phantom.exit();
});

This is great. Thanks for working out how to read these cache files!

I needed to handle more types of content files (mostly pdf). That required tightening up the interpretation of the header stuff in the cache files. Here is my fork of your gist. https://gist.github.com/OllieJones/b435641f610ff6f2bb5e

Please do whatever you wish with it. Thanks again.

Hello, thank you for this. I gave it a try but I am seeing issues. Is it possible that phantomjs changed the way they encode on disk? I checked your code and saw that (for example) you skip the first 8 bytes, then read 4 bytes for the URL length, then read the URL (some sort of TLV encoding?); this already fails for me. Can you point me to where phantomjs does such encoding so I/we can try to update the code?

Hi,

This line has an issue. Cache.js:29
var contents = fs.read(exports.cachePath+this.cacheFile,'b');

TypeError: "size" argument must be a number
at Function.Buffer.allocUnsafe (buffer.js:161:3)
at Object.fs.read (fs.js:579:21)

Any help?