fix(ui): follow redirects when fetching alerts from the UI

ui/src/Common/Fetch.js

@@ -1,6 +1,9 @@
 import merge from "lodash.merge";
 
 const FetchWithCredentials = async (uri, options) =>
-  await fetch(uri, merge({}, { credentials: "include" }, options));
+  await fetch(
+    uri,
+    merge({}, { credentials: "include", redirect: "follow" }, options)
+  );
 
 export { FetchWithCredentials };

ui/src/Common/Fetch.test.js

@@ -13,7 +13,8 @@ describe("FetchWithCredentials", () => {
     const request = FetchWithCredentials("http://example.com", {});
     await expect(request).resolves.toBeUndefined();
     expect(fetch).toHaveBeenCalledWith("http://example.com", {
-      credentials: "include"
+      credentials: "include",
+      redirect: "follow"
     });
   });
 
@@ -24,17 +25,20 @@ describe("FetchWithCredentials", () => {
     await expect(request).resolves.toBeUndefined();
     expect(fetch).toHaveBeenCalledWith("http://example.com", {
       credentials: "include",
+      redirect: "follow",
       foo: "bar"
     });
   });
 
   it("custom credentials are used when passed", async () => {
     const request = FetchWithCredentials("http://example.com", {
-      credentials: "none"
+      credentials: "none",
+      redirect: "follow"
     });
     await expect(request).resolves.toBeUndefined();
     expect(fetch).toHaveBeenCalledWith("http://example.com", {
-      credentials: "none"
+      credentials: "none",
+      redirect: "follow"
     });
   });
 });

ui/src/Components/SilenceModal/SilencePreview/index.test.js

@@ -89,7 +89,7 @@ describe("<SilencePreview />", () => {
       fetch
     ).toHaveBeenCalledWith(
       "./alerts.json?q=foo%3Dbar&q=%40alertmanager%3D~%5E%28amValue%29%24",
-      { credentials: "include" }
+      { credentials: "include", redirect: "follow" }
     );
   });
 
@@ -105,7 +105,7 @@ describe("<SilencePreview />", () => {
       fetch
     ).toHaveBeenCalledWith(
       "./alerts.json?q=foo%3Dbar&q=%40alertmanager%3D~%5E%28am1%7Cam2%29%24",
-      { credentials: "include" }
+      { credentials: "include", redirect: "follow" }
     );
   });