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HTTP RPC 规范

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方法与类型映射​

HTTP MethodMappingNotes
GET.query()Input JSON-stringified in query param.
e.g. myQuery?input=${encodeURIComponent(JSON.stringify(input))}
POST.mutation()Input as POST body.
GET.subscription()Subscriptions are supported via Server-sent Events using httpSubscriptionLink, or via WebSockets using wsLink.

访问嵌套过程​

嵌套过程通过点号分隔，因此对下方 byId 的请求最终会转换为 /api/trpc/post.byId 的请求。

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) => {
      // [...]
    }),
  }),
});

批量处理​

进行批处理时，我们会使用数据加载器将相同 HTTP 方法的所有并行过程调用合并为单个请求。

  • 被调用过程名称通过逗号 (,) 组合在 pathname 中

  • 输入参数通过名为 input 的查询参数传递，其结构为 Record<number, unknown>

  • 需要额外传递 batch=1 查询参数

  • 若响应包含不同状态码，则返回 207 Multi-Status（例如当某个调用失败而另一个成功时）

批量处理请求示例​

假设在 /api/trpc 暴露的路由如下：​

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;
  }),
});

... 且在 React 组件中定义的两个查询如下：​

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>
  );
}

上述操作将产生单次 HTTP 调用，数据如下：​

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

*) 上图中的 input 是以下操作的结果：

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`
  }),
);

批量处理响应示例​

Example output from server
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 响应规范​

为确保规范不受传输层限制，我们尽可能遵循 JSON-RPC 2.0 标准。

成功响应​

Example JSON Response
json
{
  "result": {
    "data": {
      "id": "1",
      "title": "Hello tRPC",
      "body": "..."
    }
  }
}
json
{
  "result": {
    "data": {
      "id": "1",
      "title": "Hello tRPC",
      "body": "..."
    }
  }
}
ts
interface SuccessResponse {
  result: {
    data: TOutput; // output from procedure
  }
}
ts
interface SuccessResponse {
  result: {
    data: TOutput; // output from procedure
  }
}

错误响应​

Example JSON Response
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"
        }
      }
    }
  }
]

  • 尽可能从抛出错误传播 HTTP 状态码

  • 若响应包含不同状态码，则返回 207 Multi-Status（例如当某个调用失败而另一个成功时）

  • 关于错误处理及自定义方法，详见错误格式化

错误代码与 HTTP 状态映射​

ts
const HTTP_STATUS_CODES = {
  PARSE_ERROR: 400,
  BAD_REQUEST: 400,
  UNAUTHORIZED: 401,
  PAYMENT_REQUIRED: 402,
  FORBIDDEN: 403,
  NOT_FOUND: 404,
  METHOD_NOT_SUPPORTED: 405,
  TIMEOUT: 408,
  CONFLICT: 409,
  PRECONDITION_FAILED: 412,
  PAYLOAD_TOO_LARGE: 413,
  UNSUPPORTED_MEDIA_TYPE: 415,
  UNPROCESSABLE_CONTENT: 422,
  PRECONDITION_REQUIRED: 428,
  TOO_MANY_REQUESTS: 429,
  CLIENT_CLOSED_REQUEST: 499,
  INTERNAL_SERVER_ERROR: 500,
  NOT_IMPLEMENTED: 501,
  BAD_GATEWAY: 502,
  SERVICE_UNAVAILABLE: 503,
  GATEWAY_TIMEOUT: 504,
} as const;
ts
const HTTP_STATUS_CODES = {
  PARSE_ERROR: 400,
  BAD_REQUEST: 400,
  UNAUTHORIZED: 401,
  PAYMENT_REQUIRED: 402,
  FORBIDDEN: 403,
  NOT_FOUND: 404,
  METHOD_NOT_SUPPORTED: 405,
  TIMEOUT: 408,
  CONFLICT: 409,
  PRECONDITION_FAILED: 412,
  PAYLOAD_TOO_LARGE: 413,
  UNSUPPORTED_MEDIA_TYPE: 415,
  UNPROCESSABLE_CONTENT: 422,
  PRECONDITION_REQUIRED: 428,
  TOO_MANY_REQUESTS: 429,
  CLIENT_CLOSED_REQUEST: 499,
  INTERNAL_SERVER_ERROR: 500,
  NOT_IMPLEMENTED: 501,
  BAD_GATEWAY: 502,
  SERVICE_UNAVAILABLE: 503,
  GATEWAY_TIMEOUT: 504,
} as const;

错误代码与 JSON-RPC 2.0 映射​

Available codes & JSON-RPC code
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, // 500
  NOT_IMPLEMENTED: -32603, // 501
  BAD_GATEWAY: -32603, // 502
  SERVICE_UNAVAILABLE: -32603, // 503
  GATEWAY_TIMEOUT: -32603, // 504
 
  // Implementation specific errors
  UNAUTHORIZED: -32001, // 401
  PAYMENT_REQUIRED: -32002, // 402
  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
  UNSUPPORTED_MEDIA_TYPE: -32015, // 415
  UNPROCESSABLE_CONTENT: -32022, // 422
  PRECONDITION_REQUIRED: -32028, // 428
  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, // 500
  NOT_IMPLEMENTED: -32603, // 501
  BAD_GATEWAY: -32603, // 502
  SERVICE_UNAVAILABLE: -32603, // 503
  GATEWAY_TIMEOUT: -32603, // 504
 
  // Implementation specific errors
  UNAUTHORIZED: -32001, // 401
  PAYMENT_REQUIRED: -32002, // 402
  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
  UNSUPPORTED_MEDIA_TYPE: -32015, // 415
  UNPROCESSABLE_CONTENT: -32022, // 422
  PRECONDITION_REQUIRED: -32028, // 428
  TOO_MANY_REQUESTS: -32029, // 429
  CLIENT_CLOSED_REQUEST: -32099, // 499
} as const;

覆写默认 HTTP 方法​

要覆写查询/变更的默认 HTTP 方法，可使用 methodOverride 选项：

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
import { createTRPCClient, httpLink } from '@trpc/client';
import type { AppRouter } from './server';
 
// 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
import { createTRPCClient, httpLink } from '@trpc/client';
import type { AppRouter } from './server';
 
// 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.
    }),
  ],
});

深入探索​

可通过以下 TypeScript 定义获取更多实现细节：