diff --git a/src/lib/http.test.ts b/src/lib/http.test.ts
index 28596b4..9745fe9 100644
--- a/src/lib/http.test.ts
+++ b/src/lib/http.test.ts
@@ -681,6 +681,26 @@ describe('HttpClient — Dynatrace authentication', () => {
     await client.dynatracePlatform('/platform/storage/query/v1/query:execute');
     expect(authorization).toBe('Bearer platform-token');
   });
+
+  it('preserves /e/<environment-id> path segment for Dynatrace Managed base URLs', async () => {
+    const capturedUrls: string[] = [];
+    vi.stubGlobal('fetch', async (url: string) => {
+      capturedUrls.push(url);
+      return new Response('{"entities":[],"totalCount":0}', { status: 200 });
+    });
+    const client = new HttpClient(baseConfig({
+      dynatrace: {
+        baseUrl: 'https://apm.pncint.net/e/ccd497ef-cb0f-4294-9044-1b6faead0768',
+        apiToken: 'tok',
+        platformUrl: undefined,
+        platformToken: undefined
+      }
+    }));
+    await client.dynatrace('/api/v2/entities');
+    expect(capturedUrls[0]).toBe(
+      'https://apm.pncint.net/e/ccd497ef-cb0f-4294-9044-1b6faead0768/api/v2/entities'
+    );
+  });
 });
 
 describe('HttpClient — --debug mode', () => {
diff --git a/src/lib/http.ts b/src/lib/http.ts
index c7a8ebd..962c15c 100644
--- a/src/lib/http.ts
+++ b/src/lib/http.ts
@@ -41,7 +41,14 @@ function redactHeaders(headers: RequestInit['headers']): Record<string, string>
 }
 
 function buildUrl(base: string, path: string, params?: Record<string, string | number | boolean | undefined>): string {
-  const url = new URL(path, base.endsWith('/') ? base : base + '/');
+  const normalizedBase = base.endsWith('/') ? base : base + '/';
+  // Strip a leading '/' so that new URL(path, base) resolves relative to base's full
+  // path rather than the origin. Per the WHATWG URL spec, an absolute-path reference
+  // (starting with '/') resolves against the origin and discards any path already
+  // present in base — which silently drops path segments like '/e/<environment-id>'
+  // from Dynatrace Managed or Artifactory-with-context-root base URLs.
+  const normalizedPath = path.startsWith('/') ? path.slice(1) : path;
+  const url = new URL(normalizedPath, normalizedBase);
   if (params) {
     for (const [key, val] of Object.entries(params)) {
       if (val !== undefined) {