better handle root path lookup if query params present

src/ogc-api/endpoint.spec.ts

@@ -1810,4 +1810,23 @@ The document at http://local/nonexisting?f=json could not be fetched.`
       });
     });
   });
+
+  describe('url with trailing ?', () => {
+    beforeEach(() => {
+      endpoint = new OgcApiEndpoint(
+        'http://local/sample-data/collections/airports/items?'
+      );
+    });
+    describe('#info', () => {
+      it('returns endpoint info', async () => {
+        await expect(endpoint.info).resolves.toEqual({
+          title: 'OS Open Zoomstack',
+          description:
+            'OS Open Zoomstack is a comprehensive vector basemap showing coverage of Great Britain at a national level, right down to street-level detail.',
+          attribution:
+            'Contains OS data © Crown copyright and database right 2021.',
+        });
+      });
+    });
+  });
 });

src/ogc-api/link-utils.spec.ts

@@ -18,5 +18,13 @@ describe('link utils', () => {
         'http://example.com/foo'
       );
     });
+    it('should keep query params', () => {
+      expect(getParentPath('http://example.com/foo/bar?aa=bb')).toBe(
+        'http://example.com/foo?aa=bb'
+      );
+      expect(getParentPath('http://example.com/foo/bar?')).toBe(
+        'http://example.com/foo?'
+      );
+    });
   });
 });

src/ogc-api/link-utils.ts

@@ -42,7 +42,9 @@ export function fetchRoot(url: string): Promise<OgcApiDocument> {
       }
       // if there is a collections array, we expect the parent path to end with slash
       if ('collections' in doc) {
-        parentUrl = `${parentUrl}/`;
+        const urlObj = new URL(parentUrl);
+        urlObj.pathname = `${urlObj.pathname}/`;
+        parentUrl = urlObj.toString();
       }
       return fetchRoot(parentUrl);
     }