目录
- socket解析HTTP请求内容
- 思路
- 1. 解析HTTP请求的头部
- 2. 请求头里面含有Content-Length参数
- 3. 请求头里面含有Transfer-Encoding: chunked 参数
- 代码实现
- socket 模拟http请求
socket解析HTTP请求内容
思路
1. 解析HTTP请求的头部
HTTP请求头部的结束符行为"\r\n",可以按行读取HTTP请求头的内容,如果读到一行为"\r\n",说明HTTP请求头结束。
2. 请求头里面含有Content-Length参数
如果HTTP请求里面有Content-Length参数,说明HTTP请求的内容大小是确定的,请求直www.cppcns.com接读取Content-Length的值,然后读取相应字节的的内容即可。
3. 请求头里面含有Transfer-Enzoupecoding: chunked 参数
如果HTTP请求里面有Transfer-Encoding参数,说明HTTP请求的内容大小是不确定的,这种内容的结束符是"0\r\n\r\n",因此可以按行读取HTTP请求的内容部分,如果连续读到"0\r\n"和"\r\n"说明内容读取完毕。
代码实现
代码中: self._file 代表的是socket.makefile()
def get_http_content(self): content_length = 0 transfer_encoding = False while True: req_line = self._file.readline() req_line = str(req_line, "utf-8") # 遇到http头结束符 # 读取http内容 if req_line == "\r\n": if content_length != 0: content = self._file.read(content_length) content = str(content, "utf-8") self._content = content return None if transfer_encoding: content = "" self._file.readline() while True: line = self._file.readline() line = str(line, "utf-8") if line == "0\r\n": sub_line = self._file.readline() sub_line = str(sub_line, "utf-8") if sub_line == "\r\n": self._content = content return None else: content += www.cppcns.comline continue self._content = False # 头文件没有结束 # 并且没有找到关于内容大小的字段 else: if content_length == 0 and transfer_encoding is False: words = req_line.split() if words[0] == "Content-Length:": content_length = int(words[1]) if words[0] == "Transfer-Encoding:": transfer_encoding = True self._content = False
socket 模拟http请求
# coding: utf-8 import socket from urllib.parse import urlparse def get_url(url): url = urlparse(url) howww.cppcns.comst = url.netloc path = url.path if path == "": path = "/" # 建立 socket 连接 client = socket.socket(socket.AF_INET, socket.SOCK_STREAM) client.connect((host, 80)) client.send("GET {} HTTP/1.1\r\nHost:{}\r\nConnection:close\r\n\编程客栈r\n".format(path, host).encode("utf-8")) data = b"" while True: d = client.recv(1024) if d: data += d else: break data = data.decode("utf-8") html_data = data.split("\r\n\r\n")[1] print(html_data) client.close() pass if __name__ == '__main__': get_url("http://www.baidu.com")
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