For local communications (npipe://, unix://), the hostname is not used, but we need valid and meaningful hostname. The current code used the client's `addr` as hostname in some cases, which could contain the path for the unix-socket (`/var/run/docker.sock`), which gets rejected by go1.20.6 and go1.19.11 because of a security fix for [CVE-2023-29406 ][1], which was implemented in https://go.dev/issue/60374. Prior versions go Go would clean the host header, and strip slashes in the process, but go1.20.6 and go1.19.11 no longer do, and reject the host header. This patch introduces a `DummyHost` const, and uses this dummy host for cases where we don't need an actual hostname. Signed-off-by: jingxiaolu <lujingxiao@huawei.com>
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