why `send` method automatic set `Date` header?

[fengcen]

I found the code in write_head():

if !self.headers.has::<header::Date>() {
    self.headers.set(header::Date(header::HttpDate(now_utc())));
}

I don't want to set Date header. What should I do?

[seanmonstar]

The spec says it's required. See the last sentence of the second paragraph in RFC7231#7.1.1.2:

An origin server MUST send a Date header field[...].

[smithsps]

RFC7231#7.1.1.2 - An origin server MUST NOT send a Date header field if it does not have a clock capable of providing a reasonable approximation of the current instance in Coordinated Universal Time.

It'd be uncommon, but it's technically possible that hyper could be used on such a system.

[fengcen]

Ok. Thank you for the information.

[seanmonstar]

@smithsps it could be, so I wouldn't object to some sort of config, I suppose, but I'm left wondering if it realistically ever happens.

[smithsps]

@seanmonstar agreed, the only thing I could think of could be clockless embedded device that for some reason didn't have a NTP sync.