From f632f5d7982bd08b4a47d50426732bc93d28033f Mon Sep 17 00:00:00 2001
From: shadcn <m@shadcn.com>
Date: Mon, 20 Apr 2026 11:55:06 +0400
Subject: [PATCH] feat: rename header

---
 packages/shadcn/src/registry/fetcher.test.ts | 64 +++++++++++++++++++-
 packages/shadcn/src/registry/fetcher.ts      | 16 +++--
 2 files changed, 73 insertions(+), 7 deletions(-)

diff --git a/packages/shadcn/src/registry/fetcher.test.ts b/packages/shadcn/src/registry/fetcher.test.ts
index 608672ed97..7d30448d3e 100644
--- a/packages/shadcn/src/registry/fetcher.test.ts
+++ b/packages/shadcn/src/registry/fetcher.test.ts
@@ -10,6 +10,7 @@ import { http, HttpResponse } from "msw"
 import { setupServer } from "msw/node"
 import { afterAll, afterEach, beforeAll, describe, expect, it } from "vitest"
 
+import { clearRegistryContext, setRegistryHeaders } from "./context"
 import { clearRegistryCache, fetchRegistry } from "./fetcher"
 
 const server = setupServer(
@@ -223,7 +224,68 @@ describe("fetchRegistry", () => {
     expect(acceptHeader).toBe(
       "application/vnd.shadcn.v1+json, application/json;q=0.9"
     )
-    expect(userAgentHeader).toBe("shadcn-ui")
+    expect(userAgentHeader).toBe("shadcn")
+  })
+
+  it("should allow per-registry headers to override the default Accept and User-Agent", async () => {
+    let acceptHeader: string | null = null
+    let userAgentHeader: string | null = null
+    server.use(
+      http.get(`${REGISTRY_URL}/override-test.json`, ({ request }) => {
+        acceptHeader = request.headers.get("accept")
+        userAgentHeader = request.headers.get("user-agent")
+        return HttpResponse.json({
+          name: "override-test",
+          type: "registry:ui",
+        })
+      })
+    )
+
+    setRegistryHeaders({
+      [`${REGISTRY_URL}/override-test.json`]: {
+        Accept: "application/custom+json",
+        "User-Agent": "custom-client/1.0",
+      },
+    })
+
+    await fetchRegistry(["override-test.json"], { useCache: false })
+
+    expect(acceptHeader).toBe("application/custom+json")
+    expect(userAgentHeader).toBe("custom-client/1.0")
+
+    clearRegistryContext()
+  })
+
+  it("should allow lowercase per-registry headers to override the default Accept and User-Agent", async () => {
+    let acceptHeader: string | null = null
+    let userAgentHeader: string | null = null
+    server.use(
+      http.get(
+        `${REGISTRY_URL}/lowercase-override-test.json`,
+        ({ request }) => {
+          acceptHeader = request.headers.get("accept")
+          userAgentHeader = request.headers.get("user-agent")
+          return HttpResponse.json({
+            name: "lowercase-override-test",
+            type: "registry:ui",
+          })
+        }
+      )
+    )
+
+    setRegistryHeaders({
+      [`${REGISTRY_URL}/lowercase-override-test.json`]: {
+        accept: "application/custom+json",
+        "user-agent": "custom-client/1.0",
+      },
+    })
+
+    await fetchRegistry(["lowercase-override-test.json"], { useCache: false })
+
+    expect(acceptHeader).toBe("application/custom+json")
+    expect(userAgentHeader).toBe("custom-client/1.0")
+
+    clearRegistryContext()
   })
 
   it("should send specific Accept header for direct external URLs", async () => {
diff --git a/packages/shadcn/src/registry/fetcher.ts b/packages/shadcn/src/registry/fetcher.ts
index 33d34e3ac9..8bc76265df 100644
--- a/packages/shadcn/src/registry/fetcher.ts
+++ b/packages/shadcn/src/registry/fetcher.ts
@@ -14,7 +14,7 @@ import {
 } from "@/src/registry/errors"
 import { registryItemSchema } from "@/src/schema"
 import { HttpsProxyAgent } from "https-proxy-agent"
-import fetch from "node-fetch"
+import fetch, { Headers } from "node-fetch"
 import { z } from "zod"
 
 const agent = process.env.https_proxy
@@ -50,14 +50,18 @@ export async function fetchRegistry(
         const fetchPromise = (async () => {
           // Get headers from context for this URL.
           const headers = getRegistryHeadersFromContext(url)
+          const requestHeaders = new Headers({
+            Accept: "application/vnd.shadcn.v1+json, application/json;q=0.9",
+            "User-Agent": "shadcn",
+          })
+
+          for (const [key, value] of Object.entries(headers)) {
+            requestHeaders.set(key, value)
+          }
 
           const response = await fetch(url, {
             agent,
-            headers: {
-              Accept: "application/vnd.shadcn.v1+json, application/json;q=0.9",
-              "User-Agent": "shadcn-ui",
-              ...headers,
-            },
+            headers: requestHeaders,
           })
 
           if (!response.ok) {