header_host 0.1.5

x-forwarded-host or host from http HeaderMap
Documentation 
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# header_host : x-forwarded-host or host from http HeaderMap

```rust
#[derive(Debug)]
pub struct HeaderNoHost;

impl std::fmt::Display for HeaderNoHost {
  fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
    write!(f, "no host")
  }
}

impl std::error::Error for HeaderNoHost {}

pub fn host(headers: &http::HeaderMap) -> Result<&str, HeaderNoHost> {
  let host = if let Some(host) = headers.get("x-forwarded-host") {
    host
  } else if let Some(host) = headers.get("host") {
    host
  } else {
    Err(HeaderNoHost)?;
    unreachable!();
  }
  .to_str();
  match host {
    Ok(host) => Ok(host),
    Err(_) => Err(HeaderNoHost),
  }
}

#[cfg(feature = "tld")]
pub fn tld(headers: &http::HeaderMap) -> Result<&str, HeaderNoHost> {
  Ok(xtld::tld(host(headers)?))
}
```

## About

This project is an open-source component of [i18n.site ⋅ Internationalization Solution](https://i18n.site).

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## 关于

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* [i18 :  MarkDown命令行翻译工具](https://i18n.site/i18)

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