fix(fetch): resolve relative urls against location.href, not location.origin (#717)

Co-authored-by: Artem Zakharchenko <kettanaito@gmail.com>

Author: paulSerre

src/interceptors/fetch/index.ts

@@ -45,7 +45,10 @@ export class FetchInterceptor extends Interceptor<HttpRequestEventMap> {
         typeof input === 'string' &&
         typeof location !== 'undefined' &&
         !canParseUrl(input)
-          ? new URL(input, location.origin)
+          ? new URL(
+              input,
+              location.href
+            )
           : input
 
       const request = new Request(resolvedInput, init)

test/modules/fetch/compliance/fetch-response-url.test.ts

@@ -87,3 +87,22 @@ it('returns the last response url in case of redirects', async () => {
   expect(response.url).toBe('http://localhost/destination')
   await expect(response.text()).resolves.toBe('hello world')
 })
+
+it('resolves relative URLs against location', async () => {
+  interceptor.on('request', ({ controller }) => {
+    controller.respondWith(new Response('Hello world'))
+  })
+
+  const originalLocation = global.location
+  Object.defineProperty(global, 'location', {
+    value: new URL('http://localhost/path/'),
+    configurable: true,
+  })
+
+  const response = await fetch('?x=y')
+  expect(response.url).toBe('http://localhost/path/?x=y')
+  Object.defineProperty(global, 'location', {
+    value: originalLocation,
+    configurable: true,
+  })
+})