diff --git a/components/frontend/src/app/api/auth/github/install/route.ts b/components/frontend/src/app/api/auth/github/install/route.ts
index 164667adf..bb5a5ec27 100644
--- a/components/frontend/src/app/api/auth/github/install/route.ts
+++ b/components/frontend/src/app/api/auth/github/install/route.ts
@@ -7,7 +7,7 @@ export async function POST(request: Request) {
 
   const resp = await fetch(`${BACKEND_URL}/auth/github/install`, {
     method: 'POST',
-    headers,
+    headers: { ...headers, 'Content-Type': 'application/json' },
     body,
   })
 
diff --git a/components/frontend/src/app/api/auth/github/pat/route.ts b/components/frontend/src/app/api/auth/github/pat/route.ts
index e3eed21f2..d95afdc58 100644
--- a/components/frontend/src/app/api/auth/github/pat/route.ts
+++ b/components/frontend/src/app/api/auth/github/pat/route.ts
@@ -7,7 +7,7 @@ export async function POST(request: Request) {
 
   const resp = await fetch(`${BACKEND_URL}/auth/github/pat`, {
     method: 'POST',
-    headers,
+    headers: { ...headers, 'Content-Type': 'application/json' },
     body,
   })
 
diff --git a/components/frontend/src/app/api/auth/gitlab/connect/route.ts b/components/frontend/src/app/api/auth/gitlab/connect/route.ts
index 66c65d5e5..0521e6c66 100644
--- a/components/frontend/src/app/api/auth/gitlab/connect/route.ts
+++ b/components/frontend/src/app/api/auth/gitlab/connect/route.ts
@@ -7,7 +7,7 @@ export async function POST(request: Request) {
 
   const resp = await fetch(`${BACKEND_URL}/auth/gitlab/connect`, {
     method: 'POST',
-    headers,
+    headers: { ...headers, 'Content-Type': 'application/json' },
     body,
   })
 
diff --git a/components/frontend/src/app/api/auth/jira/connect/route.ts b/components/frontend/src/app/api/auth/jira/connect/route.ts
index 333b74576..6223d41bb 100644
--- a/components/frontend/src/app/api/auth/jira/connect/route.ts
+++ b/components/frontend/src/app/api/auth/jira/connect/route.ts
@@ -7,7 +7,7 @@ export async function POST(request: Request) {
 
   const resp = await fetch(`${BACKEND_URL}/auth/jira/connect`, {
     method: 'POST',
-    headers,
+    headers: { ...headers, 'Content-Type': 'application/json' },
     body,
   })
 
diff --git a/components/frontend/src/app/api/cluster-info/route.ts b/components/frontend/src/app/api/cluster-info/route.ts
index e4c02ecfa..dfad80fe6 100644
--- a/components/frontend/src/app/api/cluster-info/route.ts
+++ b/components/frontend/src/app/api/cluster-info/route.ts
@@ -10,7 +10,7 @@ export async function GET() {
     const response = await fetch(`${BACKEND_URL}/cluster-info`, {
       method: 'GET',
       headers: {
-        'Content-Type': 'application/json',
+        'Accept': 'application/json',
       },
     });
 
diff --git a/components/frontend/src/app/api/feature-flags/route.ts b/components/frontend/src/app/api/feature-flags/route.ts
index 45c0f9a9d..47a0352ad 100644
--- a/components/frontend/src/app/api/feature-flags/route.ts
+++ b/components/frontend/src/app/api/feature-flags/route.ts
@@ -26,7 +26,7 @@ export async function GET(request: NextRequest) {
       method: 'GET',
       headers: {
         Authorization: clientKey,
-        'Content-Type': 'application/json',
+        'Accept': 'application/json',
       },
       next: { revalidate: 15 },
     });
diff --git a/components/frontend/src/app/api/projects/[name]/agentic-sessions/[sessionName]/git/configure-remote/route.ts b/components/frontend/src/app/api/projects/[name]/agentic-sessions/[sessionName]/git/configure-remote/route.ts
index 82e8f2dd4..590f24851 100644
--- a/components/frontend/src/app/api/projects/[name]/agentic-sessions/[sessionName]/git/configure-remote/route.ts
+++ b/components/frontend/src/app/api/projects/[name]/agentic-sessions/[sessionName]/git/configure-remote/route.ts
@@ -13,7 +13,7 @@ export async function POST(
     `${BACKEND_URL}/projects/${encodeURIComponent(name)}/agentic-sessions/${encodeURIComponent(sessionName)}/git/configure-remote`,
     {
       method: 'POST',
-      headers,
+      headers: { ...headers, 'Content-Type': 'application/json' },
       body,
     }
   );
diff --git a/components/frontend/src/app/api/projects/[name]/agentic-sessions/[sessionName]/repos/route.ts b/components/frontend/src/app/api/projects/[name]/agentic-sessions/[sessionName]/repos/route.ts
index bc67cfb73..0bfa8413d 100644
--- a/components/frontend/src/app/api/projects/[name]/agentic-sessions/[sessionName]/repos/route.ts
+++ b/components/frontend/src/app/api/projects/[name]/agentic-sessions/[sessionName]/repos/route.ts
@@ -13,7 +13,7 @@ export async function POST(
     `${BACKEND_URL}/projects/${encodeURIComponent(name)}/agentic-sessions/${encodeURIComponent(sessionName)}/repos`,
     {
       method: 'POST',
-      headers,
+      headers: { ...headers, 'Content-Type': 'application/json' },
       body,
     }
   );
diff --git a/components/frontend/src/app/api/projects/[name]/agentic-sessions/[sessionName]/workflow/route.ts b/components/frontend/src/app/api/projects/[name]/agentic-sessions/[sessionName]/workflow/route.ts
index 078ff284c..b85b907e2 100644
--- a/components/frontend/src/app/api/projects/[name]/agentic-sessions/[sessionName]/workflow/route.ts
+++ b/components/frontend/src/app/api/projects/[name]/agentic-sessions/[sessionName]/workflow/route.ts
@@ -13,7 +13,7 @@ export async function POST(
     `${BACKEND_URL}/projects/${encodeURIComponent(name)}/agentic-sessions/${encodeURIComponent(sessionName)}/workflow`,
     {
       method: 'POST',
-      headers,
+      headers: { ...headers, 'Content-Type': 'application/json' },
       body,
     }
   );
diff --git a/components/frontend/src/app/api/projects/[name]/agentic-sessions/route.ts b/components/frontend/src/app/api/projects/[name]/agentic-sessions/route.ts
index c311c384a..6e5e39fc9 100644
--- a/components/frontend/src/app/api/projects/[name]/agentic-sessions/route.ts
+++ b/components/frontend/src/app/api/projects/[name]/agentic-sessions/route.ts
@@ -33,7 +33,7 @@ export async function POST(
 
     const response = await fetch(`${BACKEND_URL}/projects/${encodeURIComponent(name)}/agentic-sessions`, {
       method: 'POST',
-      headers,
+      headers: { ...headers, 'Content-Type': 'application/json' },
       body,
     });
 
diff --git a/components/frontend/src/app/api/projects/[name]/feature-flags/[flagName]/override/route.ts b/components/frontend/src/app/api/projects/[name]/feature-flags/[flagName]/override/route.ts
index d974289e9..00b736804 100644
--- a/components/frontend/src/app/api/projects/[name]/feature-flags/[flagName]/override/route.ts
+++ b/components/frontend/src/app/api/projects/[name]/feature-flags/[flagName]/override/route.ts
@@ -18,7 +18,7 @@ export async function PUT(
       `${BACKEND_URL}/projects/${encodeURIComponent(projectName)}/feature-flags/${encodeURIComponent(flagName)}/override`,
       {
         method: "PUT",
-        headers,
+        headers: { ...headers, 'Content-Type': 'application/json' },
         body,
       }
     );
diff --git a/components/frontend/src/app/api/projects/[name]/keys/route.ts b/components/frontend/src/app/api/projects/[name]/keys/route.ts
index 6b33a086c..838f71e56 100644
--- a/components/frontend/src/app/api/projects/[name]/keys/route.ts
+++ b/components/frontend/src/app/api/projects/[name]/keys/route.ts
@@ -35,7 +35,7 @@ export async function POST(
 
     const response = await fetch(`${BACKEND_URL}/projects/${name}/keys`, {
       method: 'POST',
-      headers,
+      headers: { ...headers, 'Content-Type': 'application/json' },
       body: JSON.stringify(body),
     });
 
diff --git a/components/frontend/src/app/api/projects/[name]/permissions/route.ts b/components/frontend/src/app/api/projects/[name]/permissions/route.ts
index 7f57b131d..c750f8a87 100644
--- a/components/frontend/src/app/api/projects/[name]/permissions/route.ts
+++ b/components/frontend/src/app/api/projects/[name]/permissions/route.ts
@@ -35,7 +35,7 @@ export async function POST(
 
     const response = await fetch(`${BACKEND_URL}/projects/${name}/permissions`, {
       method: 'POST',
-      headers,
+      headers: { ...headers, 'Content-Type': 'application/json' },
       body: JSON.stringify(body),
     });
 
diff --git a/components/frontend/src/app/api/projects/[name]/route.ts b/components/frontend/src/app/api/projects/[name]/route.ts
index cf3a46d06..7fa422a65 100644
--- a/components/frontend/src/app/api/projects/[name]/route.ts
+++ b/components/frontend/src/app/api/projects/[name]/route.ts
@@ -34,7 +34,7 @@ export async function PUT(
 
     const response = await fetch(`${BACKEND_URL}/projects/${name}`, {
       method: 'PUT',
-      headers,
+      headers: { ...headers, 'Content-Type': 'application/json' },
       body: JSON.stringify(body),
     });
 
diff --git a/components/frontend/src/app/api/projects/[name]/settings/route.ts b/components/frontend/src/app/api/projects/[name]/settings/route.ts
index f746f1253..54b5ab6b7 100644
--- a/components/frontend/src/app/api/projects/[name]/settings/route.ts
+++ b/components/frontend/src/app/api/projects/[name]/settings/route.ts
@@ -12,8 +12,7 @@ export async function GET(
     const response = await fetch(`${BACKEND_URL}/projects/${projectName}/settings`, {
       method: "GET",
       headers: {
-        "Content-Type": "application/json",
-        // Forward authentication headers from the client request
+        "Accept": "application/json",
         "X-User-ID": request.headers.get("X-User-ID") || "",
         "X-User-Groups": request.headers.get("X-User-Groups") || "",
       },
diff --git a/components/frontend/src/app/api/projects/[name]/users/forks/route.ts b/components/frontend/src/app/api/projects/[name]/users/forks/route.ts
index 11d3c08bc..ebe9789b2 100644
--- a/components/frontend/src/app/api/projects/[name]/users/forks/route.ts
+++ b/components/frontend/src/app/api/projects/[name]/users/forks/route.ts
@@ -24,7 +24,7 @@ export async function POST(
   const body = await request.text()
   const resp = await fetch(`${BACKEND_URL}/projects/${encodeURIComponent(name)}/users/forks`, {
     method: 'POST',
-    headers,
+    headers: { ...headers, 'Content-Type': 'application/json' },
     body,
   })
   const data = await resp.text()
diff --git a/components/frontend/src/app/api/projects/route.ts b/components/frontend/src/app/api/projects/route.ts
index 7105d8961..05489ce73 100644
--- a/components/frontend/src/app/api/projects/route.ts
+++ b/components/frontend/src/app/api/projects/route.ts
@@ -39,7 +39,7 @@ export async function POST(request: NextRequest) {
 
     const response = await fetch(`${BACKEND_URL}/projects`, {
       method: 'POST',
-      headers,
+      headers: { ...headers, 'Content-Type': 'application/json' },
       body: body,
     });
 
diff --git a/components/frontend/src/app/api/version/route.ts b/components/frontend/src/app/api/version/route.ts
index 2a4f33f49..99c71562e 100644
--- a/components/frontend/src/app/api/version/route.ts
+++ b/components/frontend/src/app/api/version/route.ts
@@ -9,7 +9,7 @@ export async function GET() {
     const response = await fetch(`${BACKEND_URL}/version`, {
       method: 'GET',
       headers: {
-        'Content-Type': 'application/json',
+        'Accept': 'application/json',
       },
     });
 
diff --git a/components/frontend/src/app/api/workflows/ootb/route.ts b/components/frontend/src/app/api/workflows/ootb/route.ts
index 4cc2fb93e..f048a005c 100644
--- a/components/frontend/src/app/api/workflows/ootb/route.ts
+++ b/components/frontend/src/app/api/workflows/ootb/route.ts
@@ -12,7 +12,7 @@ export async function GET(request: NextRequest) {
 
     // Forward authorization header if present (enables GitHub token lookup for better rate limits)
     const headers: HeadersInit = {
-      "Content-Type": "application/json",
+      "Accept": "application/json",
     };
     const authHeader = request.headers.get("Authorization");
     if (authHeader) {
diff --git a/components/frontend/src/lib/auth.ts b/components/frontend/src/lib/auth.ts
index cefa09b66..59d13891b 100644
--- a/components/frontend/src/lib/auth.ts
+++ b/components/frontend/src/lib/auth.ts
@@ -33,7 +33,7 @@ export function extractAccessToken(request: Request): string | undefined {
 // Build headers to forward to backend, using only real incoming values.
 export function buildForwardHeaders(request: Request, extra?: Record<string, string>): ForwardHeaders {
   const headers: ForwardHeaders = {
-    'Content-Type': 'application/json',
+    'Accept': 'application/json',
   };
 
   const xfUser = request.headers.get('X-Forwarded-User');