fix: match protocol-relative urls in any()

`new URL()` does not accept protocol-relative URLs without a base, like
`'http://dummy'`.

This commit fixes the regular expression used for absolute URL normalization
so that kind of URLs are normalized with the dummy base.

src/lib/request-utils.js

@@ -1,6 +1,7 @@
 let URL;
 // https://stackoverflow.com/a/19709846/308237
-const absoluteUrlRX = new RegExp('^(?:[a-z]+:)?//', 'i');
+// modified, URL constructor does not support protocol-relative urls
+const absoluteUrlRX = new RegExp('^[a-z]+://', 'i');
 
 const headersToArray = (headers) => {
 	// node-fetch 1 Headers

test/specs/routing/url-matching.test.js

@@ -21,6 +21,9 @@ describe('url matching', () => {
 		expect(fm.calls(true).length).to.equal(0);
 		await fm.fetchHandler('http://a.com/path');
 		expect(fm.calls(true).length).to.equal(1);
+		// gets normalized to http://a.com/path
+		await fm.fetchHandler('//a.com/path');
+		expect(fm.calls(true).length).to.equal(1);
 	});
 
 	it('match exact strings with relative url', async () => {
@@ -128,5 +131,11 @@ describe('url matching', () => {
 			await fm.fetchHandler('http://b.com');
 			expect(fm.calls(true).length).to.equal(4);
 		});
+		it('match protocol-relative urls with catch-all', async () => {
+			fm.any(200).catch();
+
+			await fm.fetchHandler('//a.com/path');
+			expect(fm.calls(true).length).to.equal(1);
+		});
 	});
 });