# HTTP_CUSTOM_HEADER

*LSL constant*

```lsl
integer HTTP_CUSTOM_HEADER = 5;
```

Adds custom HTTP headers to the request (up to 8 per request). At the SLua level, provide a string-keyed table mapping header names to values; the serializer emits one HTTP_CUSTOM_HEADER/key/value triple per entry. Some default or sensitive headers are blocked for security reasons.

Constant groups: [HTTPRequestParam](/constants/groups/HTTPRequestParam/)

## Caveats

- The total length of all custom headers cannot exceed 4096 characters.

## See also

### Functions

- [llHTTPRequest](/functions/llHTTPRequest/)

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*Source: [HTTP CUSTOM HEADER](https://wiki.secondlife.com/wiki/HTTP_CUSTOM_HEADER) on the Second Life Wiki. Content from the Second Life Wiki article HTTP CUSTOM HEADER (revision 1213008, 2023-01-26), CC BY-SA 3.0.*

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From lsl.dev: https://lsl.dev/constants/HTTP_CUSTOM_HEADER/