diff --git a/furniture-3d-system/src/app/api/intake/non-integrated/assets/[...assetPath]/route.ts b/furniture-3d-system/src/app/api/intake/non-integrated/assets/[...assetPath]/route.ts
index 9365e4bc..a841a693 100644
--- a/furniture-3d-system/src/app/api/intake/non-integrated/assets/[...assetPath]/route.ts
+++ b/furniture-3d-system/src/app/api/intake/non-integrated/assets/[...assetPath]/route.ts
@@ -73,7 +73,6 @@ export async function GET(request: NextRequest, context: RouteContext) {
         return (await buildObjectReadResponse(
           createObjectReadUrl(objectStorageKey),
           request,
-          { redirectHttps: false },
         )) as unknown as NextResponse;
       } catch (error) {
         if (!(error instanceof ObjectReadProxyError)) {
diff --git a/furniture-3d-system/src/app/api/intake/non-integrated/upload/route.test.ts b/furniture-3d-system/src/app/api/intake/non-integrated/upload/route.test.ts
index 3c820a6e..109ca314 100644
--- a/furniture-3d-system/src/app/api/intake/non-integrated/upload/route.test.ts
+++ b/furniture-3d-system/src/app/api/intake/non-integrated/upload/route.test.ts
@@ -330,7 +330,7 @@ describe('POST /api/intake/non-integrated/upload', () => {
     expect(
       mockObjectReadResponseCalls[mockObjectReadResponseCalls.length - 1]
         ?.options,
-    ).toEqual({ redirectHttps: false })
+    ).toBeUndefined()
     expect(getResponseHeader(downloadResponse, 'Content-Type')).toBe(
       'application/pdf',
     )
diff --git a/furniture-3d-system/src/app/intake/non-integrated/core/nonIntegratedAssetServer.test.ts b/furniture-3d-system/src/app/intake/non-integrated/core/nonIntegratedAssetServer.test.ts
index ed475f7f..113e2308 100644
--- a/furniture-3d-system/src/app/intake/non-integrated/core/nonIntegratedAssetServer.test.ts
+++ b/furniture-3d-system/src/app/intake/non-integrated/core/nonIntegratedAssetServer.test.ts
@@ -1,8 +1,26 @@
 import { mkdir, mkdtemp, rm, writeFile } from "fs/promises";
+import { EventEmitter } from "node:events";
 import os from "os";
 import path from "path";
+
+const mockCreateObjectReadUrl = jest.fn();
+const mockNormalizeObjectStorageKey = jest.fn();
+const mockSpawn = jest.fn();
+const CURL_HTTP_STATUS_MARKER = "__NON_INTEGRATED_OBJECT_HTTP_STATUS__";
+
+jest.mock("@/lib/storage", () => ({
+  createObjectReadUrl: (...args: unknown[]) => mockCreateObjectReadUrl(...args),
+  normalizeObjectStorageKey: (...args: unknown[]) =>
+    mockNormalizeObjectStorageKey(...args),
+}));
+
+jest.mock("node:child_process", () => ({
+  spawn: (...args: unknown[]) => mockSpawn(...args),
+}));
+
 import {
   getNonIntegratedAssetDirectory,
+  readNonIntegratedAssetBuffer,
   resolveNonIntegratedAssetFilePath,
   resolveNonIntegratedAssetRelativeFilePath,
 } from "./nonIntegratedAssetServer";
@@ -10,14 +28,51 @@ import {
 describe("nonIntegratedAssetServer", () => {
   let cwd: string;
 
+  function createMockCurlChild(args: string[], body: string, status = 200) {
+    const child = new EventEmitter() as EventEmitter & {
+      stdout: EventEmitter & { setEncoding: jest.Mock };
+      stderr: EventEmitter & { setEncoding: jest.Mock };
+    };
+    child.stdout = Object.assign(new EventEmitter(), {
+      setEncoding: jest.fn(),
+    });
+    child.stderr = Object.assign(new EventEmitter(), {
+      setEncoding: jest.fn(),
+    });
+
+    const outputIndex = args.indexOf("-o");
+    const bodyPath = outputIndex >= 0 ? args[outputIndex + 1] : "";
+    setImmediate(async () => {
+      if (bodyPath) {
+        await writeFile(bodyPath, body);
+      }
+      child.stdout.emit("data", `${CURL_HTTP_STATUS_MARKER}${status}`);
+      child.emit("close", 0);
+    });
+
+    return child;
+  }
+
   beforeEach(async () => {
     cwd = await mkdtemp(path.join(os.tmpdir(), "non-integrated-assets-"));
     delete process.env.NON_INTEGRATED_ASSET_DIR;
+    mockSpawn.mockReset();
+    mockNormalizeObjectStorageKey.mockImplementation((key: string) =>
+      key.trim().replace(/^\/+/, ""),
+    );
+    mockCreateObjectReadUrl.mockImplementation(
+      (key: string) => `https://storage.example.com/${encodeURIComponent(key)}`,
+    );
+    global.fetch = jest.fn(async () => ({
+      ok: true,
+      arrayBuffer: async () => new TextEncoder().encode("object-body").buffer,
+    })) as unknown as typeof fetch;
   });
 
   afterEach(async () => {
     await rm(cwd, { recursive: true, force: true });
     delete process.env.NON_INTEGRATED_ASSET_DIR;
+    jest.restoreAllMocks();
   });
 
   it("stores new non-integrated assets outside the public directory by default", () => {
@@ -59,4 +114,43 @@ describe("nonIntegratedAssetServer", () => {
     ).toBe("");
     expect(resolveNonIntegratedAssetRelativeFilePath("../secret.txt", cwd)).toBe("");
   });
+
+  it("reads protected object storage assets by stable non-integrated url", async () => {
+    const buffer = await readNonIntegratedAssetBuffer(
+      "/api/intake/non-integrated/assets/SZ0230/产品模型/model.png",
+    );
+
+    expect(mockCreateObjectReadUrl).toHaveBeenCalledWith(
+      "non-integrated-assets/SZ0230/产品模型/model.png",
+    );
+    expect(fetch).toHaveBeenCalledWith(
+      "https://storage.example.com/non-integrated-assets%2FSZ0230%2F%E4%BA%A7%E5%93%81%E6%A8%A1%E5%9E%8B%2Fmodel.png",
+      { cache: "no-store" },
+    );
+    expect(buffer?.toString("utf8")).toBe("object-body");
+  });
+
+  it("falls back to curl when object storage fetch times out", async () => {
+    global.fetch = jest.fn(async () => {
+      const error = new TypeError("fetch failed") as TypeError & {
+        cause?: { code: string };
+      };
+      error.cause = { code: "ETIMEDOUT" };
+      throw error;
+    }) as unknown as typeof fetch;
+    mockSpawn.mockImplementationOnce((_command: string, args: string[]) =>
+      createMockCurlChild(args, "curl-object-body"),
+    );
+
+    const buffer = await readNonIntegratedAssetBuffer(
+      "/api/intake/non-integrated/assets/SZ0230/产品模型/model.png",
+    );
+
+    expect(mockSpawn).toHaveBeenCalledWith(
+      "curl",
+      expect.arrayContaining(["--http1.1", "-L"]),
+      expect.objectContaining({ windowsHide: true }),
+    );
+    expect(buffer?.toString("utf8")).toBe("curl-object-body");
+  });
 });
diff --git a/furniture-3d-system/src/app/intake/non-integrated/core/nonIntegratedAssetServer.ts b/furniture-3d-system/src/app/intake/non-integrated/core/nonIntegratedAssetServer.ts
index 7af819f0..a25ac6e9 100644
--- a/furniture-3d-system/src/app/intake/non-integrated/core/nonIntegratedAssetServer.ts
+++ b/furniture-3d-system/src/app/intake/non-integrated/core/nonIntegratedAssetServer.ts
@@ -1,6 +1,8 @@
 import { randomUUID } from "crypto";
+import { spawn } from "node:child_process";
 import { existsSync } from "fs";
-import { mkdir, writeFile } from "fs/promises";
+import { mkdir, mkdtemp, readFile, rm, writeFile } from "fs/promises";
+import os from "os";
 import path from "path";
 import {
   NON_INTEGRATED_DOCUMENT_PREVIEW_DIRECTORY,
@@ -13,6 +15,7 @@ import { createObjectReadUrl, normalizeObjectStorageKey } from "@/lib/storage";
 const NON_INTEGRATED_PRIVATE_ASSET_DIRECTORY_NAME = "non-integrated-assets";
 const OBJECT_STORAGE_ROUTE_PATH = "/api/storage/object";
 const NON_INTEGRATED_OBJECT_STORAGE_PREFIX = "non-integrated-assets";
+const CURL_HTTP_STATUS_MARKER = "__NON_INTEGRATED_OBJECT_HTTP_STATUS__";
 
 export type MaterializedNonIntegratedAssetFile = {
   filePath: string;
@@ -117,9 +120,19 @@ function buildSafeMaterializedFileName(objectKey: string) {
 }
 
 async function fetchObjectStorageBuffer(objectKey: string) {
-  const response = await fetch(createObjectReadUrl(objectKey), {
-    cache: "no-store",
-  });
+  const readUrl = createObjectReadUrl(objectKey);
+  let response: Response;
+  try {
+    response = await fetch(readUrl, {
+      cache: "no-store",
+    });
+  } catch (error) {
+    if (!isNetworkFetchFailure(error)) {
+      throw error;
+    }
+    return fetchObjectStorageBufferViaCurl(readUrl);
+  }
+
   if (!response.ok) {
     return null;
   }
@@ -127,6 +140,121 @@ async function fetchObjectStorageBuffer(objectKey: string) {
   return Buffer.from(await response.arrayBuffer());
 }
 
+function collectErrorCodes(error: unknown, codes = new Set<string>()) {
+  if (!error || typeof error !== "object") {
+    return codes;
+  }
+
+  const value = error as { code?: unknown; cause?: unknown; errors?: unknown };
+  if (typeof value.code === "string" && value.code.trim()) {
+    codes.add(value.code.trim());
+  }
+  if (value.cause) {
+    collectErrorCodes(value.cause, codes);
+  }
+  if (Array.isArray(value.errors)) {
+    value.errors.forEach((entry) => collectErrorCodes(entry, codes));
+  }
+
+  return codes;
+}
+
+function isNetworkFetchFailure(error: unknown) {
+  if (!(error instanceof Error)) {
+    return false;
+  }
+  if (error.message === "fetch failed") {
+    return true;
+  }
+
+  const codes = collectErrorCodes(error);
+  return [
+    "ETIMEDOUT",
+    "ECONNRESET",
+    "EPIPE",
+    "ENETUNREACH",
+    "EHOSTUNREACH",
+    "UND_ERR_CONNECT_TIMEOUT",
+    "UND_ERR_HEADERS_TIMEOUT",
+    "UND_ERR_SOCKET",
+  ].some((code) => codes.has(code));
+}
+
+function runCurl(args: string[]) {
+  return new Promise<{ stdout: string; stderr: string; exitCode: number | null }>(
+    (resolve, reject) => {
+      const child = spawn("curl", args, {
+        stdio: ["ignore", "pipe", "pipe"],
+        windowsHide: true,
+      });
+
+      let stdout = "";
+      let stderr = "";
+      child.stdout.setEncoding("utf8");
+      child.stderr.setEncoding("utf8");
+      child.stdout.on("data", (chunk) => {
+        stdout += chunk;
+      });
+      child.stderr.on("data", (chunk) => {
+        stderr += chunk;
+      });
+      child.on("error", reject);
+      child.on("close", (exitCode) => {
+        resolve({ stdout, stderr, exitCode });
+      });
+    },
+  );
+}
+
+function parseCurlHttpStatus(stdout: string) {
+  const markerIndex = stdout.lastIndexOf(CURL_HTTP_STATUS_MARKER);
+  if (markerIndex < 0) {
+    return null;
+  }
+
+  const status = Number(
+    stdout.slice(markerIndex + CURL_HTTP_STATUS_MARKER.length).trim(),
+  );
+  return Number.isFinite(status) ? status : null;
+}
+
+async function fetchObjectStorageBufferViaCurl(readUrl: string) {
+  const tempDirectory = await mkdtemp(
+    path.join(os.tmpdir(), "non-integrated-object-download-"),
+  );
+
+  try {
+    const bodyPath = path.join(tempDirectory, "response.bin");
+    const { stdout, stderr, exitCode } = await runCurl([
+      "--http1.1",
+      "-sS",
+      "-L",
+      "-o",
+      bodyPath,
+      "-w",
+      CURL_HTTP_STATUS_MARKER + "%{http_code}",
+      readUrl,
+    ]);
+    const status = parseCurlHttpStatus(stdout);
+    if (status == null) {
+      throw new Error(
+        stderr.trim() ||
+          stdout.trim() ||
+          `curl 下载失败（exit code: ${exitCode ?? "unknown"}）`,
+      );
+    }
+    if (status < 200 || status >= 300) {
+      return null;
+    }
+
+    return readFile(bodyPath);
+  } finally {
+    await rm(tempDirectory, { recursive: true, force: true }).catch(
+      () => undefined,
+    );
+  }
+}
+
 export async function readNonIntegratedAssetBuffer(
   fileUrl: string,
   _cwd = process.cwd(),
diff --git a/furniture-3d-system/src/lib/object-storage-read-response.ts b/furniture-3d-system/src/lib/object-storage-read-response.ts
index 15d9025a..2666b279 100644
--- a/furniture-3d-system/src/lib/object-storage-read-response.ts
+++ b/furniture-3d-system/src/lib/object-storage-read-response.ts
@@ -72,10 +72,15 @@ export async function buildObjectReadResponse(
     upstreamHeaders.range = range
   }
 
-  const upstreamResponse = await fetch(readUrl, {
-    headers: upstreamHeaders,
-    cache: 'no-store',
-  })
+  let upstreamResponse: Response
+  try {
+    upstreamResponse = await fetch(readUrl, {
+      headers: upstreamHeaders,
+      cache: 'no-store',
+    })
+  } catch {
+    throw new ObjectReadProxyError('对象存储读取失败', 502)
+  }
 
   if (!upstreamResponse.ok && upstreamResponse.status !== 206) {
     throw new ObjectReadProxyError('对象存储读取失败', upstreamResponse.status)
diff --git a/furniture-3d-system/src/server/services/non-integrated-ai-white-background.service.ts b/furniture-3d-system/src/server/services/non-integrated-ai-white-background.service.ts
index a2098090..c4751824 100644
--- a/furniture-3d-system/src/server/services/non-integrated-ai-white-background.service.ts
+++ b/furniture-3d-system/src/server/services/non-integrated-ai-white-background.service.ts
@@ -295,7 +295,18 @@ async function readAssetBufferByUrl(url: string) {
     );
   }
 
-  const buffer = await readNonIntegratedAssetBuffer(url);
+  let buffer: Buffer | null;
+  try {
+    buffer = await readNonIntegratedAssetBuffer(url);
+  } catch (error) {
+    throw new AppError(
+      ErrorCode.FILE_UPLOAD_FAILED,
+      `白底图源图读取失败：${readUnknownErrorMessage(
+        error,
+        "对象存储连接失败",
+      )}`,
+    );
+  }
   if (!buffer) {
     throw new AppError(ErrorCode.FILE_NOT_FOUND, "白底图所需的源图片不存在。");
   }