Function warp::filters::reply::default_header

pub fn default_header<K, V>(name: K, value: V) -> WithDefaultHeader where
    HeaderName: TryFrom<K>,
    <HeaderName as TryFrom<K>>::Error: Into<Error>,
    HeaderValue: TryFrom<V>,
    <HeaderValue as TryFrom<V>>::Error: Into<Error>, 

Wrap a Filter that adds a header to the reply, if they aren’t already set.

Note

This only adds a header if the underlying filter is successful, and returns a Reply. If the underlying filter was rejected, the header is not added.

Example

use warp::Filter;

// Set `server: warp` if not already set.
let route = warp::any()
    .map(warp::reply)
    .with(warp::reply::with::default_header("server", "warp"));