通过Netcat将UDP数据包发送到Memcached

Question

我试图通过netcat将stats命令发送给memcached，但是，我没有从memcached获得任何东西。

我试过了

echo "stats" > commands.txt
nc -u 127.0.0.1 11211 < commands.txt

我也试过

echo stats | nc -u 127.0.0.1 11211

根据我在Memcached文档第1176行底部所读到的内容，发送命令时可能必须包括

Each UDP datagram contains a simple frame header, followed by data in the
same format as the TCP protocol described above. In the current
implementation, requests must be contained in a single UDP datagram, but
responses may span several datagrams. (The only common requests that would
span multiple datagrams are huge multi-key "get" requests and "set"
requests, both of which are more suitable to TCP transport for reliability
reasons anyway.)

The frame header is 8 bytes long, as follows (all values are 16-bit integers 
in network byte order, high byte first):

0-1 Request ID
2-3 Sequence number
4-5 Total number of datagrams in this message
6-7 Reserved for future use; must be 0

我的问题是，如何使用netcat通过udp将stats命令发送到Memcached？

Answer 1

以下操作正常，必须指定框架标头

printf '\x00\x00\x00\x00\x00\x01\x00\x00stats\r\n' | nc -u 127.0.0.1 11211