使用 Python Socket GET 请求获取 400 Bad Request 错误

Question

对于学校作业，我需要发送 GET 请求并仅使用套接字接收数据。无论我如何尝试格式化 GET 请求，我都会收到 HTTP/1.1 400 Bad Request 错误。

这是我的代码（如果很糟糕请见谅，这是我第一个 python 项目）：

import socket
import sys

try:
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    print ("Creation successful")
except socket.error as err:
    print ("Creation unsuccessful. Error: %s" %(err))
    
port = 80

try:
    ip = socket.gethostbyname('gaia.cs.umass.edu')
except socket.gaierror:
    print("Error resolving host")
    sys.exit()

s.connect((ip, port))

print("Connection successful")
print("Connected to %s" %(ip))       


try:
    s.sendall("GET wireshark-labs/HTTP-ethereal-lab-file3.html HTTP/1.1\r\nHost: gaia.cs.umass.edu\r\n\r\n".encode())
    while True:
        data = s.recv(1024)
        print("Data received")
        print(data.decode('UTF-8'))
        if not data:
            print("No Data")
            s.close()
            break
except socket.gaierror:
    print("Error sending data")
    sys.exit()

这是我收到的错误：

HTTP/1.1 400 Bad Request

Date: Mon, 23 Nov 2020 07:04:03 GMT

Server: Apache/2.4.6 (CentOS) OpenSSL/1.0.2k-fips PHP/7.4.12 mod_perl/2.0.11 Perl/v5.16.3

Content-Length: 226

Connection: close

Content-Type: text/html; charset=iso-8859-1



<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>400 Bad Request</title>
</head><body>
<h1>Bad Request</h1>
<p>Your browser sent a request that this server could not understand.<br />
</p>
</body></html>

试图让这个 GET 请求工作让我发疯了，提前感谢你们给我的帮助。

Answer 1

抱歉，不能将其写为注释，因为必须包含输出。我正在尝试使用您的代码，当我更改 host 和 wireshark-labs 部分时......发生了一件奇怪的事情。我把它改成 s.sendall(b"GET / HTTP/1.1\r\nHost: www.cnn.com\r\n\r\n") 了解这是如何工作的...... 我得到的回应是......

Creation successful
Connection successful
Connected to 128.119.245.12
Data received
HTTP/1.1 200 OK
Date: Mon, 23 Nov 2020 07:48:51 GMT
Server: Apache/2.4.6 (CentOS) OpenSSL/1.0.2k-fips PHP/7.4.12 mod_perl/2.0.11 Perl/v5.16.3
Last-Modified: Tue, 01 Mar 2016 18:57:50 GMT
ETag: "a5b-52d015789ee9e"
Accept-Ranges: bytes
Content-Length: 2651
Content-Type: text/html; charset=UTF-8

<html>
<head>
<title>Computer Network Research Group - UMass Amherst
</title>
</head>
<body bgcolor="#ffffff">
<center>
<p><img 
src="cnrg_imap.jpg" 
border="0" usemap="#cnrg_imapMAP">
<map name="cnrg_imapMAP">
<area coords="290,177,407,205" shape="rect" href="/networks/resources/index.html">
<area coords="163,178,275,205" shape="rect" href="/networks/education/index.html">
<area coords="62,165,145,191" shape="rect" href="/search.html">
<area coords="6,63,157,90" shape="rect" href="/networks/collaborations.html">
<area coords="64,7,146,34" shape="rect" href="/networks/people.html">
<area coords="163,7,270,33" shape="rect" href="/networks/research.html">
<area coords="288,6,417,33" shape="rect" 
href="/networks/
Data received
publications.html">
</map>
<P>
<BR>
<BR>
<P>
<table width=100% border=0 cellpadding=0 cellspacing=0>
  <tr>
    <td width=60>&nbsp;</td>
    <td width="10%">&nbsp;</td>
    <td width="70%"> 
<font face="Helvetica,Arial,TimesNewRoman" color="#000000">
<h4>
The <a href="/index.html"> Computer Networks Research Group </a> in the <a href = "https://www.cics.umass.edu/"> School of Information and Computer Sciences</a> at
the <a href = "http://www.umass.edu/"> University of Massachusetts, Amherst </a> is led by Professors <a href = "http://www-net.cs.umass.edu/kurose/index.html">Jim Kurose </a>, and <a href = "/personnel/towsley.html">Don Towsley</a>. 
Our research spans a broad range of topics in networking, including network protocols and architecture, modeling and analysis, sensor networks, wireless networks, and network measurement. We seek a principled understanding of new and emerging areas through a complementary mix of theoretical and applied experimental research. 
  </td>
  <td width="10%">&nbsp;</td>
 </
Data received
tr>
</table>

 
</h4>

</font>
<p>
<!-- QUP Button & QualNet link markup start -->
<a href="http://www.scalable-networks.com/customers/qup/index.php">
<img src="http://www.scalable-networks.com/images/qupmember.gif" border=0
alt="QualNet  Network Simulator University Program"></a>
<a href="http://www.scalable-networks.com">QualNet Network Simulator</a>
<!-- End of QUP Button HTML & QualNet link markup -->
<p>
<p>
<center>
<font size="1">
<a href="/networks/people.html"> PEOPLE |</a> 
<a href="/networks/research.html"> RESEARCH |</a> 
<a href="http://www-net.cs.umass.edu/networks/publications.html"> PUBLICATIONS |</a> 
<a href="/networks/collaborations.html"> COLLABORATIONS |</a> 
<a href="http://gaia.cs.umass.edu/search.html"> SEARCH |</a> 
<a href="/networks/education/index.html"> EDUCATION |</a> 
<a href="/networks/resources/index.html"> 
RESOURCES</a> 
<p>

</font>
</center>
</body>
</html>

Data received

No Data

Process finished with exit code 0

您正在寻找什么。似乎sendall 命令中的host 值在某处被覆盖。不知道wireshark-labs 部分有多少。希望信息有所帮助。此外，当我将您的代码粘贴到 pycharm 中时，它会在此处发出警告 s.connect((ip, port)) s could be undefined。 P.S:- 我不是socket 编程方面的专家。如有错误请见谅。只是想帮忙。