fix(sdk-trace-web): make parseUrl respect document.baseURI (#3670)

* fix parseUrl to handle baseurl override for relative urls

* tests

* lint fixes

* add changelog entry

---------

Co-authored-by: Daniel Dyla <[email protected]>

Author: domasx2

CHANGELOG.md

@@ -15,6 +15,7 @@ For experimental package changes, see the [experimental CHANGELOG](experimental/
 
 ### :bug: (Bug Fix)
 
+* fix(sdk-trace-web): make `parseUrl()` respect document.baseURI [#3670](https://github.com/open-telemetry/opentelemetry-js/pull/3670) @domasx2
 * fix(resource): make properties for async resource resolution optional [#3677](https://github.com/open-telemetry/opentelemetry-js/pull/3677) @pichlermarc
 * fix(resources): change fs/promises import to be node 12 compatible [#3681](https://github.com/open-telemetry/opentelemetry-js/pull/3681) @pichlermarc
 

packages/opentelemetry-sdk-trace-web/src/utils.ts

@@ -305,7 +305,10 @@ export interface URLLike {
  */
 export function parseUrl(url: string): URLLike {
   if (typeof URL === 'function') {
-    return new URL(url, location.href);
+    return new URL(
+      url,
+      typeof document !== 'undefined' ? document.baseURI : location.href
+    );
   }
   const element = getUrlNormalizingAnchor();
   element.href = url;

packages/opentelemetry-sdk-trace-web/test/window/utils.test.ts

@@ -171,6 +171,12 @@ describe('utils', () => {
         assert.strictEqual(typeof url[field], 'string');
       });
     });
+
+    it('should correctly parse relative url in presence of base tag', () => {
+      sinon.stub(globalThis.document, 'baseURI').value('http://foobar.com');
+      const url = parseUrl('foo/bar');
+      assert.strictEqual(url.href, 'http://foobar.com/foo/bar');
+    });
   });
 
   describe('normalizeUrl', () => {