Source:
public static URL from(String rawUrl, Function<String, String> domainFromHost, Function<String, Boolean> isValidHost) { if (rawUrl.contains(PAGE_ID_SEP)) { badUrl(false, "Skipping raw URL as it contains '" + PAGE_ID_SEP +"':" + rawUrl); } String trimUrl = rawUrl.trim(); if (trimUrl.length() < 8) { badUrl(false, "Raw URL is too short to start with valid protocol: " + rawUrl); } String urlNoProto = ""; boolean secure = false; int port = 80; if (trimUrl.substring(0, 7).equalsIgnoreCase(HTTP_PROTO)) { urlNoProto = trimUrl.substring(7); } else if (trimUrl.substring(0, 8).equalsIgnoreCase(HTTPS_PROTO)) { urlNoProto = trimUrl.substring(8); secure = true; port = 443; } else { badUrl(false, "Raw URL does not start with valid protocol: " + rawUrl); } String hostPort; String[] args = urlNoProto.split(URL_SEP_REGEX, 2); String path; String sep; if (args.length == 2) { hostPort = args[0].toLowerCase(); int sepIndex = args[0].length(); sep = urlNoProto.substring(sepIndex, sepIndex + 1); path = sep + args[1]; } else { hostPort = urlNoProto.toLowerCase(); path = "/"; } args = hostPort.split(":", 2); String host; if (args.length == 2) { host = args[0]; try { port = Integer.parseInt(args[1]); } catch (NumberFormatException ignored) { } } else { host = hostPort; } if (host.isEmpty()) { badUrl(false, "Raw URL cannot have empty host: " + rawUrl); } String domain = host; if (!isValidIP(host)) { if (!isValidHost.apply(host)) { badUrl(false, "Raw URL (" + rawUrl + ") has invalid host: " + host); } domain = domainFromHost.apply(host); } return new URL(domain, host, path, port, secure); }

Target:
public static URL from(String rawUrl, Function<String, String> domainFromHost, Function<String, Boolean> isValidHost) { if (rawUrl.contains(PAGE_ID_SEP)) { badUrl(false, "Skipping raw URL as it contains '" + PAGE_ID_SEP + "':" + rawUrl); } String trimUrl = rawUrl.trim(); if (trimUrl.length() < 8) { badUrl(false, "Raw URL is too short to start with valid protocol: " + rawUrl); } String urlNoProto = ""; boolean secure = false; int port = 80; if (trimUrl.substring(0, 7).equalsIgnoreCase(HTTP_PROTO)) { urlNoProto = trimUrl.substring(7); } else if (trimUrl.substring(0, 8).equalsIgnoreCase(HTTPS_PROTO)) { urlNoProto = trimUrl.substring(8); secure = true; port = 443; } else { badUrl(false, "Raw URL does not start with valid protocol: " + rawUrl); } String hostPort; String[] args = urlNoProto.split(URL_SEP_REGEX, 2); String path; String sep; if (args.length == 2) { hostPort = args[0].toLowerCase(); int sepIndex = args[0].length(); sep = urlNoProto.substring(sepIndex, sepIndex + 1); path = sep + args[1]; } else { hostPort = urlNoProto.toLowerCase(); path = "/"; } args = hostPort.split(":", 2); String host; if (args.length == 2) { host = args[0]; try { port = Integer.parseInt(args[1]); } catch (NumberFormatException e) { badUrl(false, "Raw URL (" + rawUrl + ") has invalid port: " + args[1]); } } else { host = hostPort; } if (host.isEmpty()) { badUrl(false, "Raw URL cannot have empty host: " + rawUrl); } String domain = host; boolean ipHost = isValidIP(host); if (!ipHost) { if (!isValidHost.apply(host)) { badUrl(false, "Raw URL (" + rawUrl + ") has invalid host: " + host); } domain = domainFromHost.apply(host); } return new URL(domain, host, path, port, secure, ipHost); }