Fix JSDOM.fromURL() bugs in the browser build

Extracted from #3393.

Co-authored-by: LungZeno <lungzenoopen@gmail.com>

lib/api.js

@@ -136,7 +136,7 @@ class JSDOM {
         options = Object.assign(options, {
           url: req.href + originalHash,
           contentType: res.headers["content-type"],
-          referrer: req.getHeader("referer")
+          referrer: req.getHeader("referer") ?? undefined
         });
 
         return new JSDOM(body, options);

lib/jsdom/living/helpers/http-request.js

@@ -95,9 +95,21 @@ module.exports = class Request extends Writable {
   _performRequest() {
     const urlOptions = new URL(this.currentURL);
     const scheme = urlOptions.protocol;
-    this._requestOptions.agent = this.agents[scheme.substring(0, scheme.length - 1)];
+
+    // browserify's (http|https).request() does not work correctly with the (url, options, callback) signature. Instead
+    // we need to have options for each of the URL components. Note that we can't use the spread operator because URL
+    // instances don't have own properties for the URL components.
+    const requestOptions = {
+      ...this._requestOptions,
+      agent: this.agents[scheme.substring(0, scheme.length - 1)],
+      protocol: urlOptions.protocol,
+      hostname: urlOptions.hostname,
+      port: urlOptions.port,
+      path: urlOptions.pathname + urlOptions.search
+    };
+
     const { request } = scheme === "https:" ? https : http;
-    this._currentRequest = request(this.currentURL, this._requestOptions, response => {
+    this._currentRequest = request(requestOptions, response => {
       this._processResponse(response);
     });
 
@@ -211,9 +223,10 @@ module.exports = class Request extends Writable {
         statusCode !== 204 &&
         statusCode !== 304
       ) {
+        // Browserify's zlib does not support zlib.constants.
         const zlibOptions = {
-          flush: zlib.constants.Z_SYNC_FLUSH,
-          finishFlush: zlib.constants.Z_SYNC_FLUSH
+          flush: (zlib.constants ?? zlib).Z_SYNC_FLUSH,
+          finishFlush: (zlib.constants ?? zlib).Z_SYNC_FLUSH
         };
         const contentEncoding = (response.headers["content-encoding"] || "identity").trim().toLowerCase();
         if (contentEncoding === "gzip") {