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# nng_msg_header
## NAME
nng_msg_header --- return message header
## SYNOPSIS
```c
#include <nng/nng.h>
void *nng_msg_header(nng_msg *msg);
```
## DESCRIPTION
The `nng_msg_header()` function returns a pointer to the start of the {{i:header}}
content of the [message][msg] _msg_.
> [!NOTE]
> The message header contains protocol-specific header content. Most
> applications should not need to access this content, but it is available
> for [raw mode][raw] sockets.
> [!NOTE]
> The value returned by this is invalidated by a call to any of the
> functions that modify the message or the header content.
## RETURN VALUES
Pointer to start of message header.
## SEE ALSO
[nng_msg_alloc][nng_msg_alloc],
[nng_msg_body][nng_msg_body],
[nng_msg_free][nng_msg_free],
[nng_msg_header_append][nng_msg_header_append],
[nng_msg_header_chop][nng_msg_header_chop],
[nng_msg_header_insert][nng_msg_header_insert]
[nng_msg_header_len][nng_msg_header_len],
[nng_msg_header_trim][nng_msg_header_trim]
{{#include ../refs.md}}
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