当一个HTTP响应完了吗？ [英] When is an HTTP response finished?

问题描述

我写一个简单的HTTP客户端.NET学习之用。我现在用的是.NET 插座类，最终使用的Winsock 。我不想使用的WebRequest ，<一个HREF =htt​​p://msdn.microsoft.com/en-us/library/system.net.httpwebrequest.aspx相对=nofollow> HttpWebRequest的或的 HttpClient的类，因为它们使用的 的WinINet，我不想用，因为我这样做对我自己的理解是如何HTTP工作。

I am writing a simple HTTP client in .NET for learning purposes. I am using the .NET Socket class, which ultimately uses Winsock. I do not want to use the WebRequest, HttpWebRequest, or HttpClient classes, as they use WinINet, which I do not want to use as I am doing this for my own understanding of how HTTP works.

我想知道如何确定何时HTTP响应结束。通过读取HTTP / 1.1规范（ 2616 ），我想下面的伪code是如何确定当HTTP响应结束。

I am wondering how to determine when an HTTP response is finished. By reading the HTTP/1.1 specification (RFC 2616), I think the following pseudocode is how to determine when an HTTP response is finished.

parse HTTP headers
if parse not successful:
    throw error
if HTTP version is 1.1 and Transfer-encoding is chunked:
    parse first line of each chunk as an ASCII hexadecimal, the chunk size
    if parse not successful:
        throw error
    read each chunk until chunk size 0
else if Content-Length is specified:
    read Content-Length number of bytes
else:
    throw error

这是一个更多或更少正确的做法？

Is this a more-or-less correct approach?

推荐答案

您的理解是基本正确的，有一些小的修正，每次的 2616第4.4节：

Your understanding is mostly correct, with some minor corrections, per RFC 2616 Section 4.4:

Read and parse HTTP headers
if not successful:
    throw error
if response can contain message body:
    if HTTP version is 1.1+ and Transfer-encoding is not identity:
        while true:
            read line, extract delimited ASCII hexadecimal, the chunk size
            if not successful:
                throw error
             if chunk size is 0:
                break while loop
             read chunk size number of bytes
        read and parse trailing HTTP headers
    else if Content-Length is specified:
        read Content-Length number of bytes
    else if Content-Type is "multipart/byteranges":
        read and parse MIME-encoded chunks until terminating MIME boundary is reached
    else:
        read until connection is closed

这篇关于当一个HTTP响应完了吗？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！