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# nng_msg_header_len
## NAME
nng_msg_header_len --- return message header length
## SYNOPSIS
```c
#include <nng/nng.h>
size_t nng_msg_header_len(nng_msg *msg);
```
## DESCRIPTION
The `nng_msg_header_len()` returns the length of the header of [message][msg] _msg_.
## RETURN VALUES
Length of message header.
## SEE ALSO
[nng_msg_header][nng_msg_header]
{{#include ../refs.md}}
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