Stored in 2 bytes with the high-order byte first. Integer A number in the range of 0 to 2^16 (32768). C-style) may work in some places, but it won't in others. Using other non-zero values as true (i.e. Boolean A single byte, 1 = true, 0 = false. There are four data types in the protocol: bytes, booleans, integers and strings. If anyone with a better knowledge of socket calls can step in, that would be great. I'm guessing the bytes are little-endian, because that's what XDR specifies, and I'm guessing that sys/socket library is magically making that so (on the C side). There is a bit of an XDR heritage to this protocol, but it differs in lots of ways (no 4 byte alignment, for example).īyte order: I am not clear about the endian-ness of the individual bytes. See Response Packet Structures below for details. (Note: this is unrelated to HTTP chunked tranfer).Įach message is accompanied by a differently formatted packet of data. This is necessary because the packets have a fixed maximum size and arbitrary amounts of data can be included the body of a request (for uploaded files, for example). Get further data from the request if it hasn't all been transferred yet.
Send a chunk of body data back to the browser. Send a set of headers back to the browser. As it does so, it can send the following messages back to the web server: If there is a body to the request (content-length > 0), that is sent in a separate packet immediately after.Īt this point, the servlet container is presumably ready to start processing the request. Details of that format are below in Request Packet Structure. HTTP headers, etc) is sent over the connection in a highly condensed form (e.g. Once a connection is assigned to handle a particular request, the basic request informaton (e.g. The connecton is handling a specific request. No request is being handled over this connection. Once the web server has opened a connection to the servlet container, the connection can be in one of the following states:
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This makes for much simpler code at either end of the connection, although it does cause more connections to be open at once. In other words, requests are not multiplexed over connections. Once a connection is assigned to a particular request, it will not be used for any others until the request-handling cycle has terminated. To cut down on the expensive process of socket creation, the web server will attempt to maintain persistent TCP connections to the servlet container, and to reuse a connection for multiple request/response cycles. The web server communicates with the servlet container over TCP connections. A binary format was presumably chosen over the more readable plain text for reasons of performance.
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