```
// Body is the request's body.
//
// For client requests, a nil body means the request has no
// body, such as a GET request. The HTTP Client's Transport
// is responsible for calling the Close method.
//
// For server requests, the Request Body is always non-nil
// but will return EOF immediately when no body is present.
// The Server will close the request body. The ServeHTTP
// Handler does not need to.
//
// Body must allow Read to be called concurrently with Close.
// In particular, calling Close should unblock a Read waiting
// for input.
Body io.ReadCloser
```
According to the document of http.Request, the Body *must allow Read to be
called concurrently with Close. In particular, calling Close should unblock
a Read waiting for input.*
I would like to use the return value of os.Open() directly as the Body of
a http.Request like this:
```
file, _ := os.Open("example.md")
http.DefaultClient.Do(&http.Request{
Body: file,
})
```
Is that appropriate? Does os.File meet the requirement "*must allow Read to
be called concurrently with Close. In particular, calling Close should
unblock a Read waiting for input*"?
I'd appreciate it if someone could help me out!
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