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版本：11.x

HTTP RPC 規範

方法 <-> 型別對應​

HTTP 方法對應備註
GET.query()輸入 JSON 字串化在查詢參數中。
例如 myQuery?input=${encodeURIComponent(JSON.stringify(input))}
POST.mutation()輸入為 POST 主體。
不適用.subscription()HTTP 傳輸不支援訂閱

存取巢狀程序​

巢狀程序以點分隔，因此對下方 byId 的請求最終會成為對 /api/trpc/post.byId 的請求。

ts
export const appRouter = router({
  post: router({
    byId: publicProcedure.input(String).query(async (opts) => {
      // [...]
    }),
  }),
});
ts
export const appRouter = router({
  post: router({
    byId: publicProcedure.input(String).query(async (opts) => {
      // [...]
    }),
  }),
});

批次處理​

批次處理時，我們使用資料載入器，將同一個 HTTP 方法的所有平行程序呼叫合併成一個請求。

  • 被呼叫的程序名稱會以逗號 (,) 結合在 pathname 中。
  • 輸入參數會作為一個稱為 input 的查詢參數傳送，其形狀為 Record<number, unknown>。
  • 我們也需要將 batch=1 傳遞為查詢參數。
  • 如果回應有不同的狀態，我們會傳回 207 Multi-Status （例如，如果一個呼叫出錯，而另一個成功）

批次處理範例請求​

假設有一個路由器像這樣公開在 /api/trpc：​

server/router.ts
tsx
export const appRouter = t.router({
  postById: t.procedure.input(String).query(async (opts) => {
    const post = await opts.ctx.post.findUnique({
      where: { id: opts.input },
    });
    return post;
  }),
  relatedPosts: t.procedure.input(String).query(async (opts) => {
    const posts = await opts.ctx.findRelatedPostsById(opts.input);
    return posts;
  }),
});
server/router.ts
tsx
export const appRouter = t.router({
  postById: t.procedure.input(String).query(async (opts) => {
    const post = await opts.ctx.post.findUnique({
      where: { id: opts.input },
    });
    return post;
  }),
  relatedPosts: t.procedure.input(String).query(async (opts) => {
    const posts = await opts.ctx.findRelatedPostsById(opts.input);
    return posts;
  }),
});

... 以及在 React 元件中定義的兩個查詢如下：​

MyComponent.tsx
tsx
export function MyComponent() {
  const post1 = trpc.postById.useQuery('1');
  const relatedPosts = trpc.relatedPosts.useQuery('1');
  return (
    <pre>
      {JSON.stringify(
        {
          post1: post1.data ?? null,
          relatedPosts: relatedPosts.data ?? null,
        },
        null,
        4,
      )}
    </pre>
  );
}
MyComponent.tsx
tsx
export function MyComponent() {
  const post1 = trpc.postById.useQuery('1');
  const relatedPosts = trpc.relatedPosts.useQuery('1');
  return (
    <pre>
      {JSON.stringify(
        {
          post1: post1.data ?? null,
          relatedPosts: relatedPosts.data ?? null,
        },
        null,
        4,
      )}
    </pre>
  );
}

上述內容將產生一個 HTTP 呼叫，其資料如下：​

位置屬性值
pathname/api/trpc/postById,relatedPosts
search?batch=1&input=%7B%220%22%3A%221%22%2C%221%22%3A%221%22%7D *

*) 上述的 input 是

ts
encodeURIComponent(
  JSON.stringify({
    0: '1', // <-- input for `postById`
    1: '1', // <-- input for `relatedPosts`
  }),
);
ts
encodeURIComponent(
  JSON.stringify({
    0: '1', // <-- input for `postById`
    1: '1', // <-- input for `relatedPosts`
  }),
);

批次處理範例回應​

伺服器範例輸出
json
[
  // result for `postById`
  {
    "result": {
      "data": {
        "id": "1",
        "title": "Hello tRPC",
        "body": "..."
        // ...
      }
    }
  },
  // result for `relatedPosts`
  {
    "result": {
      "data": [
        /* ... */
      ]
    }
  }
]
json
[
  // result for `postById`
  {
    "result": {
      "data": {
        "id": "1",
        "title": "Hello tRPC",
        "body": "..."
        // ...
      }
    }
  },
  // result for `relatedPosts`
  {
    "result": {
      "data": [
        /* ... */
      ]
    }
  }
]

HTTP 回應規範​

為了有一個不論傳輸層為何都能運作的規範，我們盡可能地遵循 JSON-RPC 2.0。

成功回應​

JSON 回應範例
json
{
  "result": {
    "data": {
      "id": "1",
      "title": "Hello tRPC",
      "body": "..."
    }
  }
}
json
{
  "result": {
    "data": {
      "id": "1",
      "title": "Hello tRPC",
      "body": "..."
    }
  }
}
ts
{
  result: {
    data: TOutput; // output from procedure
  }
}
ts
{
  result: {
    data: TOutput; // output from procedure
  }
}

錯誤回應​

JSON 回應範例
json
[
  {
    "error": {
      "json": {
        "message": "Something went wrong",
        "code": -32600, // JSON-RPC 2.0 code
        "data": {
          // Extra, customizable, meta data
          "code": "INTERNAL_SERVER_ERROR",
          "httpStatus": 500,
          "stack": "...",
          "path": "post.add"
        }
      }
    }
  }
]
json
[
  {
    "error": {
      "json": {
        "message": "Something went wrong",
        "code": -32600, // JSON-RPC 2.0 code
        "data": {
          // Extra, customizable, meta data
          "code": "INTERNAL_SERVER_ERROR",
          "httpStatus": 500,
          "stack": "...",
          "path": "post.add"
        }
      }
    }
  }
]

  • 我們會盡可能從拋出的錯誤傳播 HTTP 狀態碼。
  • 如果回應有不同的狀態，我們會傳回 207 Multi-Status （例如，如果一個呼叫出錯，而另一個成功）
  • 如需瞭解更多有關錯誤以及如何自訂錯誤的資訊，請參閱錯誤格式化。

錯誤碼 <-> HTTP 狀態​

ts
PARSE_ERROR: 400,
BAD_REQUEST: 400,
UNAUTHORIZED: 401,
NOT_FOUND: 404,
FORBIDDEN: 403,
METHOD_NOT_SUPPORTED: 405,
TIMEOUT: 408,
CONFLICT: 409,
PRECONDITION_FAILED: 412,
PAYLOAD_TOO_LARGE: 413,
UNPROCESSABLE_CONTENT: 422,
TOO_MANY_REQUESTS: 429,
CLIENT_CLOSED_REQUEST: 499,
INTERNAL_SERVER_ERROR: 500,
NOT_IMPLEMENTED: 501,
ts
PARSE_ERROR: 400,
BAD_REQUEST: 400,
UNAUTHORIZED: 401,
NOT_FOUND: 404,
FORBIDDEN: 403,
METHOD_NOT_SUPPORTED: 405,
TIMEOUT: 408,
CONFLICT: 409,
PRECONDITION_FAILED: 412,
PAYLOAD_TOO_LARGE: 413,
UNPROCESSABLE_CONTENT: 422,
TOO_MANY_REQUESTS: 429,
CLIENT_CLOSED_REQUEST: 499,
INTERNAL_SERVER_ERROR: 500,
NOT_IMPLEMENTED: 501,

錯誤碼 <-> JSON-RPC 2.0 錯誤碼​

可用的碼和 JSON-RPC 碼
ts
/**
 * JSON-RPC 2.0 Error codes
 *
 * `-32000` to `-32099` are reserved for implementation-defined server-errors.
 * For tRPC we're copying the last digits of HTTP 4XX errors.
 */
export const TRPC_ERROR_CODES_BY_KEY = {
  /**
   * Invalid JSON was received by the server.
   * An error occurred on the server while parsing the JSON text.
   */
  PARSE_ERROR: -32700,
  /**
   * The JSON sent is not a valid Request object.
   */
  BAD_REQUEST: -32600, // 400
  // Internal JSON-RPC error
  INTERNAL_SERVER_ERROR: -32603,
  NOT_IMPLEMENTED: -32603,
  // Implementation specific errors
  UNAUTHORIZED: -32001, // 401
  FORBIDDEN: -32003, // 403
  NOT_FOUND: -32004, // 404
  METHOD_NOT_SUPPORTED: -32005, // 405
  TIMEOUT: -32008, // 408
  CONFLICT: -32009, // 409
  PRECONDITION_FAILED: -32012, // 412
  PAYLOAD_TOO_LARGE: -32013, // 413
  UNPROCESSABLE_CONTENT: -32022, // 422
  TOO_MANY_REQUESTS: -32029, // 429
  CLIENT_CLOSED_REQUEST: -32099, // 499
} as const;
ts
/**
 * JSON-RPC 2.0 Error codes
 *
 * `-32000` to `-32099` are reserved for implementation-defined server-errors.
 * For tRPC we're copying the last digits of HTTP 4XX errors.
 */
export const TRPC_ERROR_CODES_BY_KEY = {
  /**
   * Invalid JSON was received by the server.
   * An error occurred on the server while parsing the JSON text.
   */
  PARSE_ERROR: -32700,
  /**
   * The JSON sent is not a valid Request object.
   */
  BAD_REQUEST: -32600, // 400
  // Internal JSON-RPC error
  INTERNAL_SERVER_ERROR: -32603,
  NOT_IMPLEMENTED: -32603,
  // Implementation specific errors
  UNAUTHORIZED: -32001, // 401
  FORBIDDEN: -32003, // 403
  NOT_FOUND: -32004, // 404
  METHOD_NOT_SUPPORTED: -32005, // 405
  TIMEOUT: -32008, // 408
  CONFLICT: -32009, // 409
  PRECONDITION_FAILED: -32012, // 412
  PAYLOAD_TOO_LARGE: -32013, // 413
  UNPROCESSABLE_CONTENT: -32022, // 422
  TOO_MANY_REQUESTS: -32029, // 429
  CLIENT_CLOSED_REQUEST: -32099, // 499
} as const;

覆寫預設的 HTTP 方法​

若要覆寫用於查詢/變異的 HTTP 方法，可以使用 methodOverride 選項

server/httpHandler.ts
tsx
// Your server must separately allow the client to override the HTTP method
const handler = createHTTPHandler({
  router: router,
  allowMethodOverride: true,
});
server/httpHandler.ts
tsx
// Your server must separately allow the client to override the HTTP method
const handler = createHTTPHandler({
  router: router,
  allowMethodOverride: true,
});
client/trpc.ts
tsx
// The client can then specify which HTTP method to use for all queries/mutations
const client = createTRPCClient<AppRouter>({
  links: [
    httpLink({
      url: `http://localhost:3000`,
      methodOverride: 'POST', // all queries and mutations will be sent to the tRPC Server as POST requests.
    }),
  ],
});
client/trpc.ts
tsx
// The client can then specify which HTTP method to use for all queries/mutations
const client = createTRPCClient<AppRouter>({
  links: [
    httpLink({
      url: `http://localhost:3000`,
      methodOverride: 'POST', // all queries and mutations will be sent to the tRPC Server as POST requests.
    }),
  ],
});

深入探討​

您可以深入探討下列 TypeScript 定義，以閱讀更多詳細資訊