HTTP/1.0 Protocol

RFC 1945 defines the foundational HTTP/1.0 protocol. HTTP/1.0 uses single-shot TCP connections where the server signals EOF by closing the connection.

Key Characteristics

• Connection Closure: Connections close after each response by default; persistent Keep-Alive requires non-standard headers.
• No Chunked Encoding: Body framing relies entirely on the Content-Length header or closing the socket.
• Optional Host Header: Virtual hosting was not standardized in RFC 1945, though HTTPX transmits it for server compatibility.
• No Pipeline: Requests cannot be queued or pipelined on the same connection.

Wire Request Example

GET /index.html HTTP/1.0

Host: legacy.example.com

Connection: close

Client Usage

const res = try client.get("http://legacy-host.lan/", .{
    .httpVersion = .http10,
});
defer res.deinit();

std.debug.print("Status: {d}\n", .{res.status});

Related

• Protocol: HTTP/1.1
• Guide: Requests