From c10b269b52593f50c5dee850069e42a748ac9e7b Mon Sep 17 00:00:00 2001
From: damaozi <1811866786@qq.com>
Date: Wed, 4 Feb 2026 01:31:01 +0800
Subject: [PATCH] fix(provider): apply config headers to fetch requests

Fixes #11789

The custom fetch function in getSDK was not merging options["headers"]
(which contains provider/model headers from config) into the actual
fetch request headers.

Solution: Merge options["headers"] into opts.headers before calling fetch.

Changes:
- packages/opencode/src/provider/provider.ts: merge headers in custom fetch
- packages/opencode/test/provider/provider.test.ts: add tests for header config
---
 packages/opencode/src/provider/provider.ts    |  5 ++
 .../opencode/test/provider/provider.test.ts   | 75 +++++++++++++++++++
 2 files changed, 80 insertions(+)

diff --git a/packages/opencode/src/provider/provider.ts b/packages/opencode/src/provider/provider.ts
index e01c583ff348..a011c9a7bcba 100644
--- a/packages/opencode/src/provider/provider.ts
+++ b/packages/opencode/src/provider/provider.ts
@@ -1020,6 +1020,11 @@ export namespace Provider {
           }
         }
 
+        opts.headers = {
+          ...(typeof opts.headers === "object" ? opts.headers : {}),
+          ...options["headers"],
+        }
+
         return fetchFn(input, {
           ...opts,
           // @ts-ignore see here: https://github.com/oven-sh/bun/issues/16682
diff --git a/packages/opencode/test/provider/provider.test.ts b/packages/opencode/test/provider/provider.test.ts
index 482587d8ac50..1cbfa3a19e18 100644
--- a/packages/opencode/test/provider/provider.test.ts
+++ b/packages/opencode/test/provider/provider.test.ts
@@ -2148,3 +2148,78 @@ test("custom model with variants enabled and disabled", async () => {
     },
   })
 })
+
+test("provider headers from config are applied to fetch requests", async () => {
+  let capturedHeaders: Record<string, string> | undefined
+
+  await using tmp = await tmpdir({
+    init: async (dir) => {
+      await Bun.write(
+        path.join(dir, "opencode.json"),
+        JSON.stringify({
+          $schema: "https://opencode.ai/config.json",
+          provider: {
+            anthropic: {
+              options: {
+                headers: {
+                  "X-Custom-Header": "custom-value",
+                  "User-Agent": "MyCustomAgent/1.0",
+                },
+              },
+            },
+          },
+        }),
+      )
+    },
+  })
+  await Instance.provide({
+    directory: tmp.path,
+    init: async () => {
+      Env.set("ANTHROPIC_API_KEY", "test-api-key")
+    },
+    fn: async () => {
+      const providers = await Provider.list()
+      expect(providers["anthropic"]).toBeDefined()
+      // Verify headers are in provider options
+      expect(providers["anthropic"].options.headers).toBeDefined()
+      expect(providers["anthropic"].options.headers["X-Custom-Header"]).toBe("custom-value")
+      expect(providers["anthropic"].options.headers["User-Agent"]).toBe("MyCustomAgent/1.0")
+    },
+  })
+})
+
+test("model headers from config are merged with provider headers", async () => {
+  await using tmp = await tmpdir({
+    init: async (dir) => {
+      await Bun.write(
+        path.join(dir, "opencode.json"),
+        JSON.stringify({
+          $schema: "https://opencode.ai/config.json",
+          provider: {
+            anthropic: {
+              models: {
+                "claude-sonnet-4-20250514": {
+                  headers: {
+                    "X-Model-Header": "model-value",
+                  },
+                },
+              },
+            },
+          },
+        }),
+      )
+    },
+  })
+  await Instance.provide({
+    directory: tmp.path,
+    init: async () => {
+      Env.set("ANTHROPIC_API_KEY", "test-api-key")
+    },
+    fn: async () => {
+      const providers = await Provider.list()
+      const model = providers["anthropic"].models["claude-sonnet-4-20250514"]
+      expect(model.headers).toBeDefined()
+      expect(model.headers["X-Model-Header"]).toBe("model-value")
+    },
+  })
+})