Close #60 修正POST请求无Content-Length字段时无法转发请求的问题

* 部分HTTP POST请求中无有Content-Length字段，导致无法确定请求的边界。
* 现修正为，当发现Content-Length字段缺失时，Passthrough整个TCP连接。
* TODO: 解析POST编码或回应411应答。

plugin/protocol/http/src/http_entry.cpp

@@ -362,6 +362,11 @@ enum tfe_stream_action __http_connection_entry_on_request(const struct tfe_strea
 	}
 
 	/* Some kind of error happened, write log and detach the stream */
+	if (ret == -1 && hf_private_req_in->is_passthrough)
+	{
+		goto __errout;
+	}
+
 	if (ret == -1)
 	{
 		TFE_STREAM_LOG_ERROR(stream, "Failed at parsing stream as HTTP: %u, %s, %s",
@@ -475,6 +480,12 @@ enum tfe_stream_action __http_connection_entry_on_response(const struct tfe_stre
 		return hf_private_resp_in->stream_action;
 	}
 
+	/* Need to passthrough */
+	if (ret == -1 && hf_private_resp_in->is_passthrough)
+	{
+		goto __errout;
+	}
+
 	/* Some kind of error happened, write log and detach the stream */
 	if (ret == -1)
 	{