> ## Documentation Index
> Fetch the complete documentation index at: https://alltick.co/apis/llms.txt
> Use this file to discover all available pages before exploring further.

# HTTP Common Standard Header

> This page details the common standard HTTP headers required by AllTick REST market data APIs, including token, Content-Type, Accept, and other mandatory or optional fields, with examples to help developers build valid HTTP request headers for authenticated access to forex, stock, and crypto tick data.

## Common Request Header Description

| Field | Name | Type | Required | Description |
| - | - | - | - | - |
| trace | Trace ID | string | Yes | Generated uniquely by the requester. The response keeps the same value as the request. Maximum length: 64. |
| data | Data body | object | Yes | See each interface definition for the specific data format. |

```json theme={null}
{
  "trace": "c2a8a146-a647-4d6f-ac07-8c4805bf0b74",
  "data": {}
}
```

## Common Response Header Description

| Field | Name | Type | Description |
| - | - | - | - |
| ret | Return value | int32 | [Error Code Description](https://alltick.co/apis/apis/en/getting-started/error-code-description.md) |
| msg | Message | string | Specific description of success or failure. |
| trace | Trace ID | string | Generated uniquely by the requester. The response keeps the same value as the request. Maximum length: 64. |
| data | Data body | object | See each interface definition for the specific data format. |

```json theme={null}
{
  "ret": 202,
  "msg": "request data param invalid",
  "trace": "c2a8a146-a647-4d6f-ac07-8c4805bf0b74",
  "data": {}
}
```

***

#### AllTick Website

> [!NOTE]
>
> Official website: \[[https://alltick.co/](https://alltick.co/)]\([https://alltick.co/](https://alltick.co/))


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