143      // finding the transfer-encoding header
144      let transfer_encoding = headers
145          .iter()
146          .find(|h: &&Header| h.field.equiv("Transfer-Encoding"))
147          .map(|h| h.value.clone());
148  
149      // finding the content-length header
150      let content_length = if transfer_encoding.is_some() {
151          // if transfer-encoding is specified, the Content-Length
152          // header must be ignored (RFC2616 #4.4)
153          None

218      } else if transfer_encoding.is_some() {
219          // if a transfer-encoding was specified, then "chunked" is ALWAYS applied
220          // over the message (RFC2616 #3.6)
221          Box::new(FusedReader::new(Decoder::new(source_data))) as Box<dyn Read + Send + 'static>

use std::io::Read;
use tiny_http::{Response, Server};

fn main() {
    let server = Server::http("127.0.0.1:8005").unwrap();
    for mut request in server.incoming_requests() {
        let te = request.headers().iter()
            .find(|h| h.field.equiv("Transfer-Encoding"))
            .map(|h| h.value.as_str().to_string());
        let cl = request.headers().iter()
            .find(|h| h.field.equiv("Content-Length"))
            .map(|h| h.value.as_str().to_string());
        let mut body = Vec::new();
        let r = request.as_reader().read_to_end(&mut body);
        println!("TE={:?} CL={:?} read={:?} body={:?}",
                 te, cl, r, String::from_utf8_lossy(&body));
        let _ = request.respond(Response::from_string("ok"));
    }
}

printf 'POST / HTTP/1.1\r\nHost: x\r\nTransfer-Encoding: identity\r\nContent-Length: 5\r\n\r\nhello' | nc -w 2 127.0.0.1 8005

TE=Some("identity") CL=Some("5") read=Err(Custom { kind: InvalidInput, error: DecoderError }) body=""

printf 'POST / HTTP/1.1\r\nHost: x\r\nTransfer-Encoding: chunked, identity\r\n\r\n5\r\nhello\r\n0\r\n\r\n' | nc -w 2 127.0.0.1 8005

TE=Some("chunked, identity") CL=None read=Ok(5) body="hello"