HTTP基本身份验证不适用于Python 3

Question

我正在尝试启用HTTP基本身份验证来访问Intranet站点。

这是我正在使用的代码：

from bs4 import BeautifulSoup
import urllib.request, base64, urllib.error

request = urllib.request.Request(url)
string = '%s:%s' % ('username','password')

base64string = base64.standard_b64encode(string.encode('utf-8'))

request.add_header("Authorization", "Basic %s" % base64string)
try:
    u = urllib.request.urlopen(request)
except urllib.error.HTTPError as e:
    print(e)
    print(e.headers)

soup = BeautifulSoup(u.read(), 'html.parser')

print(soup.prettify())

但是它不起作用并且失败了，401 Authorization required.我无法弄清楚为什么它不起作用。

Answer 1

此处给出的解决方案无需任何修改即可工作。

from bs4 import BeautifulSoup
import urllib.request

# create a password manager
password_mgr = urllib.request.HTTPPasswordMgrWithDefaultRealm()

# Add the username and password.
# If we knew the realm, we could use it instead of None.
top_level_url = "http://example.com/foo/"
password_mgr.add_password(None, top_level_url, username, password)

handler = urllib.request.HTTPBasicAuthHandler(password_mgr)

# create "opener" (OpenerDirector instance)
opener = urllib.request.build_opener(handler)

# use the opener to fetch a URL
u = opener.open(url)

soup = BeautifulSoup(u.read(), 'html.parser')

前面的代码也可以正常工作。您只需要解码utf-8编码的字符串，否则标头包含字节序列。

from bs4 import BeautifulSoup
import urllib.request, base64, urllib.error

request = urllib.request.Request(url)
string = '%s:%s' % ('username','password')

base64string = base64.standard_b64encode(string.encode('utf-8'))

request.add_header("Authorization", "Basic %s" % base64string.decode('utf-8'))
try:
    u = urllib.request.urlopen(request)
except urllib.error.HTTPError as e:
    print(e)
    print(e.headers)

soup = BeautifulSoup(u.read(), 'html.parser')

print(soup.prettify())