diff --git a/keyserver/src/responders/landing-handler.js b/keyserver/src/responders/landing-handler.js
--- a/keyserver/src/responders/landing-handler.js
+++ b/keyserver/src/responders/landing-handler.js
@@ -229,37 +229,6 @@
   // We remove trailing slash for `react-router`
   const routerBasename = basePath.replace(/\/$/, '');
   const clientPath = routerBasename + req.url;
-  await new Promise<void>((resolve, reject) => {
-    const {
-      pipe,
-    }: {
-      +pipe: (
-        destination: $Response,
-        options?: { +end?: boolean, ... },
-      ) => void,
-      ...
-    } = renderToPipeableStream(
-      <LandingSSR
-        url={clientPath}
-        basename={routerBasename}
-        siweNonce={siweNonce}
-        siwePrimaryIdentityPublicKey={siwePrimaryIdentityPublicKey}
-        siweMessageType={siweMessageType}
-        siweMessageIssuedAt={siweMessageIssuedAt}
-      />,
-      {
-        onShellReady() {
-          pipe(res, { end: false });
-        },
-        onAllReady() {
-          resolve();
-        },
-        onError(error) {
-          reject(error);
-        },
-      },
-    );
-  });
 
   const siweNonceString = siweNonce ? `"${siweNonce}"` : 'null';
   const siwePrimaryIdentityPublicKeyString = siwePrimaryIdentityPublicKey
@@ -271,17 +240,46 @@
   const siweMessageIssuedAtString = siweMessageIssuedAt
     ? `"${siweMessageIssuedAt}"`
     : 'null';
-  // prettier-ignore
-  res.end(html`</div>
-        <script>var routerBasename = "${routerBasename}";</script>
-        <script>var siweNonce = ${siweNonceString};</script>
-        <script>var siwePrimaryIdentityPublicKey = ${siwePrimaryIdentityPublicKeyString};</script>
-        <script>var siweMessageType = ${siweMessageTypeString};</script>
-        <script>var siweMessageIssuedAt = ${siweMessageIssuedAtString};</script>
-        <script src="${jsURL}"></script>
-      </body>
-    </html>
-  `);
+
+  await new Promise((resolve, reject) => {
+    let didError = false;
+    const { pipe }: { pipe: ($Response, options?: { end: boolean }) => mixed } =
+      renderToPipeableStream(
+        <LandingSSR
+          url={clientPath}
+          basename={routerBasename}
+          siweNonce={siweNonce}
+          siwePrimaryIdentityPublicKey={siwePrimaryIdentityPublicKey}
+          siweMessageType={siweMessageType}
+          siweMessageIssuedAt={siweMessageIssuedAt}
+        />,
+        {
+          onAllReady() {
+            pipe(res, { end: false });
+            res.statusCode = didError ? 500 : 200;
+
+            // prettier-ignore
+            res.end(html`</div>
+            <script>var routerBasename = "${routerBasename}";</script>
+            <script>var siweNonce = ${siweNonceString};</script>
+            <script>var siwePrimaryIdentityPublicKey = ${siwePrimaryIdentityPublicKeyString};</script>
+            <script>var siweMessageType = ${siweMessageTypeString};</script>
+            <script>var siweMessageIssuedAt = ${siweMessageIssuedAtString};</script>
+            <script src="${jsURL}"></script>
+            </body>
+            </html>
+          `);
+
+            resolve();
+          },
+          onError(x) {
+            didError = true;
+            console.error('Stream error', x);
+            reject(x);
+          },
+        },
+      );
+  });
 }
 
 export default landingHandler;
diff --git a/keyserver/src/responders/website-responders.js b/keyserver/src/responders/website-responders.js
--- a/keyserver/src/responders/website-responders.js
+++ b/keyserver/src/responders/website-responders.js
@@ -179,41 +179,39 @@
   `);
 
   const Loading = await loadingPromise;
-  await new Promise<void>((resolve, reject) => {
-    const {
-      pipe,
-    }: {
-      +pipe: (
-        destination: $Response,
-        options?: { +end?: boolean, ... },
-      ) => void,
-      ...
-    } = renderToPipeableStream(<Loading />, {
-      onShellReady() {
-        pipe(res, { end: false });
-      },
-      onAllReady() {
-        resolve();
-      },
-      onError(error) {
-        reject(error);
-      },
-    });
+
+  await new Promise((resolve, reject) => {
+    let didError = false;
+    const { pipe }: { pipe: ($Response, options?: { end: boolean }) => mixed } =
+      renderToPipeableStream(<Loading />, {
+        onAllReady() {
+          pipe(res);
+          res.statusCode = didError ? 500 : 200;
+
+          // prettier-ignore
+          res.end(html`
+          </div>
+          <script>
+            var keyserverURL = "${keyserverURL}";
+            var baseURL = "${baseURL}";
+            var olmFilename = "${olmFilename}";
+            var commQueryExecutorFilename = "${commQueryExecutorFilename}";
+            var backupClientFilename = "${backupClientFilename}";
+            var webworkersOpaqueFilename = "${webworkersOpaqueFilename}"
+          </script>
+          <script src="${jsURL}"></script>
+        </body>
+      </html>
+        `);
+          resolve();
+        },
+        onError(x) {
+          didError = true;
+          console.error('Stream error', x);
+          reject(x);
+        },
+      });
   });
-  res.end(html`
-    </div>
-    <script>
-          var keyserverURL = "${keyserverURL}";
-          var baseURL = "${baseURL}";
-          var olmFilename = "${olmFilename}";
-          var commQueryExecutorFilename = "${commQueryExecutorFilename}";
-          var backupClientFilename = "${backupClientFilename}";
-          var webworkersOpaqueFilename = "${webworkersOpaqueFilename}"
-        </script>
-        <script src="${jsURL}"></script>
-      </body>
-    </html>
-  `);
 }
 
 // On native, if this responder is called, it means that the app isn't
diff --git a/yarn.lock b/yarn.lock
--- a/yarn.lock
+++ b/yarn.lock
@@ -21227,14 +21227,6 @@
     dnd-core "^11.1.3"
     hoist-non-react-statics "^3.3.0"
 
-react-dom@18.1.0:
-  version "18.1.0"
-  resolved "https://registry.yarnpkg.com/react-dom/-/react-dom-18.1.0.tgz#7f6dd84b706408adde05e1df575b3a024d7e8a2f"
-  integrity sha512-fU1Txz7Budmvamp7bshe4Zi32d0ll7ect+ccxNu9FlObT605GOEB8BfO4tmRJ39R5Zj831VCpvQ05QPBW5yb+w==
-  dependencies:
-    loose-envify "^1.1.0"
-    scheduler "^0.22.0"
-
 react-dom@19.1.0:
   version "19.1.0"
   resolved "https://registry.yarnpkg.com/react-dom/-/react-dom-19.1.0.tgz#133558deca37fa1d682708df8904b25186793623"
@@ -21755,13 +21747,6 @@
     "@babel/runtime" "^7.0.0"
     memoize-one ">=3.1.1 <6"
 
-react@18.1.0:
-  version "18.1.0"
-  resolved "https://registry.yarnpkg.com/react/-/react-18.1.0.tgz#6f8620382decb17fdc5cc223a115e2adbf104890"
-  integrity sha512-4oL8ivCz5ZEPyclFQXaNksK3adutVS8l2xzZU0cqEFrE9Sb7fC0EFK5uEk74wIreL1DERyjvsU915j1pcT2uEQ==
-  dependencies:
-    loose-envify "^1.1.0"
-
 react@19.1.0:
   version "19.1.0"
   resolved "https://registry.yarnpkg.com/react/-/react-19.1.0.tgz#926864b6c48da7627f004795d6cce50e90793b75"