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## 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 message header of _msg_.

### Return Values

Length of message header.

### See Also

xref:nng_msg_header.adoc[nng_msg_header]