public static MessageBody For(
HttpVersion httpVersion,
HttpRequestHeaders headers,
Http1Connection context)
{
// see also http://tools.ietf.org/html/rfc2616#section-4.4
var keepAlive = httpVersion != HttpVersion.Http10;
var upgrade = false;
if (headers.HasConnection)
{
var connectionOptions = HttpHeaders.ParseConnection(headers.HeaderConnection);
upgrade = (connectionOptions & ConnectionOptions.Upgrade) != 0;
keepAlive = (connectionOptions & ConnectionOptions.KeepAlive) != 0;
}
if (upgrade)
{
if (headers.HeaderTransferEncoding.Count > 0 || (headers.ContentLength.HasValue && headers.ContentLength.Value != 0))
{
KestrelBadHttpRequestException.Throw(RequestRejectionReason.UpgradeRequestCannotHavePayload);
}
context.OnTrailersComplete(); // No trailers for these.
return(new Http1UpgradeMessageBody(context));
}
if (headers.HasTransferEncoding)
{
var transferEncoding = headers.HeaderTransferEncoding;
var transferCoding = HttpHeaders.GetFinalTransferCoding(transferEncoding);
// https://tools.ietf.org/html/rfc7230#section-3.3.3
// If a Transfer-Encoding header field
// is present in a request and the chunked transfer coding is not
// the final encoding, the message body length cannot be determined
// reliably; the server MUST respond with the 400 (Bad Request)
// status code and then close the connection.
if (transferCoding != TransferCoding.Chunked)
{
KestrelBadHttpRequestException.Throw(RequestRejectionReason.FinalTransferCodingNotChunked, transferEncoding);
}
// TODO may push more into the wrapper rather than just calling into the message body
// NBD for now.
return(new Http1ChunkedEncodingMessageBody(keepAlive, context));
}
if (headers.ContentLength.HasValue)
{
var contentLength = headers.ContentLength.Value;
if (contentLength == 0)
{
return(keepAlive ? MessageBody.ZeroContentLengthKeepAlive : MessageBody.ZeroContentLengthClose);
}
return(new Http1ContentLengthMessageBody(keepAlive, contentLength, context));
}
// If we got here, request contains no Content-Length or Transfer-Encoding header.
// Reject with 411 Length Required.
if (context.Method == HttpMethod.Post || context.Method == HttpMethod.Put)
{
var requestRejectionReason = httpVersion == HttpVersion.Http11 ? RequestRejectionReason.LengthRequired : RequestRejectionReason.LengthRequiredHttp10;
KestrelBadHttpRequestException.Throw(requestRejectionReason, context.Method);
}
context.OnTrailersComplete(); // No trailers for these.
return(keepAlive ? MessageBody.ZeroContentLengthKeepAlive : MessageBody.ZeroContentLengthClose);
}
