Include error response body in API client errors

src/lib/curseforge/client.ts

@@ -1,3 +1,5 @@
+import { readErrorBody } from "../utils/fetch";
+
 /** CurseForge API 客户端，封装两套 API 的鉴权与 User-Agent。 */
 export class CurseForgeClient {
   /** GET /v1/mods/{modId}/files 等只读接口 */
@@ -38,8 +40,9 @@ export class CurseForgeClient {
       headers: this.apiHeaders(),
     });
     if (!res.ok) {
+      const body = await readErrorBody(res);
       throw new Error(
-        `CurseForge API GET ${path} failed: ${res.status} ${res.statusText}`,
+        `CurseForge API GET ${path} failed: ${res.status} ${res.statusText}\n${body}`,
       );
     }
     return res.json() as Promise<T>;
@@ -51,8 +54,9 @@ export class CurseForgeClient {
       headers: this.uploadHeaders(),
     });
     if (!res.ok) {
+      const body = await readErrorBody(res);
       throw new Error(
-        `CurseForge Upload GET ${path} failed: ${res.status} ${res.statusText}`,
+        `CurseForge Upload GET ${path} failed: ${res.status} ${res.statusText}\n${body}`,
       );
     }
     return res.json() as Promise<T>;
@@ -69,8 +73,9 @@ export class CurseForgeClient {
       body,
     });
     if (!res.ok) {
+      const resBody = await readErrorBody(res);
       throw new Error(
-        `CurseForge Upload POST ${path} failed: ${res.status} ${res.statusText}`,
+        `CurseForge Upload POST ${path} failed: ${res.status} ${res.statusText}\n${resBody}`,
       );
     }
     return res.json() as Promise<T>;

src/lib/modrinth/client.ts

@@ -1,3 +1,5 @@
+import { readErrorBody } from "../utils/fetch";
+
 /** Modrinth API v2 的基础请求客户端，封装鉴权与 User-Agent。 */
 export class ModrinthClient {
   private base = "https://api.modrinth.com/v2";
@@ -26,8 +28,9 @@ export class ModrinthClient {
       headers: this.headers(),
     });
     if (!res.ok) {
+      const body = await readErrorBody(res);
       throw new Error(
-        `Modrinth API GET ${path} failed: ${res.status} ${res.statusText}`,
+        `Modrinth API GET ${path} failed: ${res.status} ${res.statusText}\n${body}`,
       );
     }
     return res.json() as Promise<T>;
@@ -44,8 +47,9 @@ export class ModrinthClient {
       body,
     });
     if (!res.ok) {
+      const resBody = await readErrorBody(res);
       throw new Error(
-        `Modrinth API POST ${path} failed: ${res.status} ${res.statusText}`,
+        `Modrinth API POST ${path} failed: ${res.status} ${res.statusText}\n${resBody}`,
       );
     }
     return res.json() as Promise<T>;

src/lib/utils/fetch.ts

@@ -0,0 +1,12 @@
+/**
+ * 读取错误响应体文本（最多 4096 字符），用于拼入错误信息。
+ * 若读取失败则返回兜底字符串。
+ */
+export async function readErrorBody(res: Response): Promise<string> {
+  try {
+    const text = await res.text();
+    return text.slice(0, 4096);
+  } catch {
+    return "(unable to read response body)";
+  }
+}