#[derive(Debug, thiserror::Error)]
pub enum ServiceError {
    #[error("no response generated; the proxy is misconfigured")]
    NoResponse,
    #[error("request taken; the proxy is misconfigured")]
    RequestTaken,
    #[error("limit reached. try again")]
    Limit(#[from] tokio::sync::TryAcquireError),
    #[error("hyper error")]
    Hyper(hyper::Error),
    #[error("no host")]
    NoHost,
    #[error("unknown host")]
    UnknownHost,
    #[error("unknown path")]
    UnknownPath,
    #[error("can't connect to the backend")]
    CantConnect,
    #[error("not found")]
    NotFound,
    #[error("io error: {0}")]
    Io(#[from] std::io::Error),
    #[error("bad range")]
    BadRange,
    #[error("bad utf8")]
    BadUtf8(#[from] std::str::Utf8Error),
    #[error("bad utf8")]
    BadUtf82(#[from] std::string::FromUtf8Error),
    #[error("bad path")]
    BadPath,
    #[error("bad auth")]
    BadAuth,
    #[error("bad base64: {0}")]
    BadBase64(#[from] base64::DecodeError),
    #[error("connection upgrade failed")]
    UpgradeFailed,
    #[error("{0}")]
    Custom(String),
    #[error("parse int error: {0}")]
    ParseIntError(#[from] std::num::ParseIntError),
    #[error("invalid header")]
    InvalidHeader,
    #[error("impossible error")]
    Other,
}