如何知道数据的总大小？
我正在使用 libevent 创建一个小型 p2p 网络。
假设我想从一个节点发送 10,000 字节缓冲区到另一个节点，由于 libevent 一次可以发送的最大大小是 4,096 字节（所以 4,096 + 4,096 + 1,808）。
从技术上讲，接收数据的节点是否可以（在 TCP 协议中）知道接收到前 4,096 个字节时将发送的字节总数？
I'm using libevent for creating a small p2p network.
Let's say that I want to send 10,000 bytes buffer from one node to another, due to libevent the max size that can be send in one time is 4,096 bytes (so 4,096 + 4,096 + 1,808).
Is it technically possible (in TCP protocol) for the node that receives the data, to know the total number of bytes that will be sent when receives the first 4,096 bytes ?
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不会。但是，应用程序协议通常会告诉接收方需要多少字节。对于 HTTP 1.1，它是
Content-Length标头。您还可以按照No. It is, however, common for the application protocol to tell the receiver how many bytes to expect. With HTTP 1.1, it's the
Content-Lengthheader. You can also use length prefix along the lines of<len><data>. PostgresSQL uses that protocol between the front and backend.