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# nng_msg_header_insert
## NAME
nng_msg_header_insert --- prepend to message header
## SYNOPSIS
```c
#include <nng/nng.h>
int nng_msg_header_insert(nng_msg *msg, const void *val, size_t size);
int nng_msg_header_insert_u16(nng_msg *msg, uint16_t val16);
int nng_msg_header_insert_u32(nng_msg *msg, uint32_t val32);
int nng_msg_header_insert_u64(nng_msg *msg, uint64_t val64);
```
## DESCRIPTION
The `nng_msg_header_insert()` family of functions
prepends data to the front of the headers of [message][msg] _msg_, reallocating
if necessary.
The first function prepends _size_ bytes, copying them from _val_.
The remaining functions prepend the specified value (such as _val32_) in
network-byte order (big-endian).
## RETURN VALUES
These functions return 0 on success, and non-zero otherwise.
## ERRORS
- `NNG_ENOMEM`: Insufficient free memory exists.
## SEE ALSO
[nng_msg_header][nng_msg_header],
[nng_msg_header_append][nng_msg_header_append]
[nng_msg_header_chop][nng_msg_header_chop],
[nng_msg_header_len][nng_msg_header_len],
[nng_msg_header_trim][nng_msg_header_trim]
{{#include ../refs.md}}
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