remove thiserror dep

Author: dignifiedquire

Cargo.toml

@@ -16,7 +16,6 @@ url = "2.1.0"
 httparse = "1.3.3"
 async-std = { version = "1.4.0", features = ["unstable"] }
 http-types = { path = '../http-types' }
-thiserror = "1.0.9"
 pin-project-lite = "0.1.1"
 byte-pool = "0.2.1"
 lazy_static = "1.4.0"

src/server.rs

@@ -1,5 +1,11 @@
 //! Process HTTP connections on the server.
 
+use std::error::Error;
+use std::fmt;
+use std::pin::Pin;
+use std::str::FromStr;
+use std::time::Duration;
+
 use async_std::future::{timeout, Future, TimeoutError};
 use async_std::io::{self, BufReader};
 use async_std::io::{Read, Write};
@@ -8,23 +14,37 @@ use async_std::task::{Context, Poll};
 use futures_core::ready;
 use http_types::headers::{HeaderName, HeaderValue, CONTENT_LENGTH, TRANSFER_ENCODING};
 use http_types::{Body, Method, Request, Response};
-use std::str::FromStr;
-use std::time::Duration;
-use thiserror::Error;
-
-use std::pin::Pin;
 
 use crate::chunked::ChunkedDecoder;
 use crate::date::fmt_http_date;
 use crate::{Exception, MAX_HEADERS};
 
 /// Errors when handling incoming requests.
-#[derive(Debug, Error)]
+#[derive(Debug)]
 pub enum HttpError {
-    #[error("unexpected content-length header")]
     UnexpectedContentLengthHeader,
 }
 
+impl fmt::Display for HttpError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            HttpError::UnexpectedContentLengthHeader => write!(f, "{}", self.description()),
+        }
+    }
+}
+
+impl Error for HttpError {
+    fn description(&self) -> &str {
+        match self {
+            HttpError::UnexpectedContentLengthHeader => "unexpected content-length header",
+        }
+    }
+
+    fn cause(&self) -> Option<&dyn Error> {
+        None
+    }
+}
+
 /// Parse an incoming HTTP connection.
 ///
 /// Supports `KeepAlive` requests by default.