> ## Documentation Index
> Fetch the complete documentation index at: https://injectivelabs-docs-ai-sdk.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# 查询 GraphQL 端点

本指南展示如何使用 `@injectivelabs/utils` 中的 `HttpClient` 查询 GraphQL 端点。

## 设置

```ts theme={null}
import { HttpClient } from '@injectivelabs/utils'

const client = new HttpClient('YOUR_GRAPHQL_ENDPOINT')
```

## 认证

如果你的 GraphQL 端点需要认证，设置 headers：

```ts theme={null}
client.setConfig({
  headers: { 
    authorization: 'Bearer YOUR_API_KEY' 
  }
})
```

## 发起查询

将你的 GraphQL 查询构造为包含 `query` 和可选 `variables` 的 JSON 字符串：

```ts theme={null}
const query = JSON.stringify({
  query: `
    query GetData($id: ID!) {
      entity(id: $id) {
        id
        name
        value
      }
    }
  `,
  variables: {
    id: '123'
  }
})

const response = await client.post<string, { data: { data: YourResponseType } }>('', query)

console.log(response.data.data)
```

## 完整示例

```ts theme={null}
import { HttpClient } from '@injectivelabs/utils'

interface Token {
  id: string
  symbol: string
  name: string
}

interface TokensResponse {
  tokens: Token[]
}

const client = new HttpClient('YOUR_GRAPHQL_ENDPOINT')

// 如果需要，设置认证 headers
client.setConfig({
  headers: { 
    authorization: 'Bearer YOUR_API_KEY' 
  }
})

const query = JSON.stringify({
  query: `
    query GetTokens($first: Int!) {
      tokens(first: $first, orderBy: symbol) {
        id
        symbol
        name
      }
    }
  `,
  variables: {
    first: 10
  }
})

const response = await client.post<string, { data: { data: TokensResponse } }>('', query)

console.log(response.data.data.tokens)
```

## 错误处理

GraphQL 响应即使状态码为 200 也可能包含错误。始终检查错误：

```ts theme={null}
interface GraphQLResponse<T> {
  data?: T
  errors?: Array<{ message: string }>
}

const response = await client.post<string, { data: GraphQLResponse<YourResponseType> }>('', query)

if (response.data.errors && response.data.errors.length > 0) {
  throw new Error(response.data.errors[0].message)
}

const data = response.data.data
```