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An extensible library for opening URLs using a variety of protocols
The simplest way to use this module is to call the urlopen function,
which accepts a string containing a URL or a Request object (described
below). It opens the URL and returns the results as file-like
object; the returned object has some extra methods described below.
The OpenerDirector manages a collection of Handler objects that do
all the actual work. Each Handler implements a particular protocol or
option. The OpenerDirector is a composite object that invokes the
Handlers needed to open the requested URL. For example, the
HTTPHandler performs HTTP GET and POST requests and deals with
non-error returns. The HTTPRedirectHandler automatically deals with
HTTP 301, 302, 303 and 307 redirect errors, and the HTTPDigestAuthHandler
deals with digest authentication.
urlopen(url, data=None) -- Basic usage is the same as original
urllib. pass the url and optionally data to post to an HTTP URL, and
get a file-like object back. One difference is that you can also pass
a Request instance instead of URL. Raises a URLError (subclass of
OSError); for HTTP errors, raises an HTTPError, which can also be
treated as a valid response.
build_opener -- Function that creates a new OpenerDirector instance.
Will install the default handlers. Accepts one or more Handlers as
arguments, either instances or Handler classes that it will
instantiate. If one of the argument is a subclass of the default
handler, the argument will be installed instead of the default.
install_opener -- Installs a new opener as the default opener.
objects of interest:
OpenerDirector -- Sets up the User Agent as the Python-urllib client and manages
the Handler classes, while dealing with requests and responses.
Request -- An object that encapsulates the state of a request. The
state can be as simple as the URL. It can also include extra HTTP
headers, e.g. a User-Agent.
BaseHandler --
internals:
BaseHandler and parent
_call_chain conventions
Example usage:
import urllib.request
# set up authentication info
authinfo = urllib.request.HTTPBasicAuthHandler()
authinfo.add_password(realm='PDQ Application',
uri='https://mahler:8092/site-updates.py',
user='klem',
passwd='geheim$parole')
proxy_support = urllib.request.ProxyHandler({"http" : "http://ahad-haam:3128"})
# build a new opener that adds authentication and caching FTP handlers
opener = urllib.request.build_opener(proxy_support, authinfo,
urllib.request.CacheFTPHandler)
# install it
urllib.request.install_opener(opener)
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Open the URL url, which can be either a string or a Request object.
*data* must be an object specifying additional data to be sent to
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details.
urllib.request module uses HTTP/1.1 and includes a "Connection:close"
header in its HTTP requests.
The optional *timeout* parameter specifies a timeout in seconds for
blocking operations like the connection attempt (if not specified, the
global default timeout setting will be used). This only works for HTTP,
HTTPS and FTP connections.
If *context* is specified, it must be a ssl.SSLContext instance describing
the various SSL options. See HTTPSConnection for more details.
The optional *cafile* and *capath* parameters specify a set of trusted CA
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For HTTP and HTTPS URLs, this function returns a http.client.HTTPResponse
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msg attribute contains the same information as the reason attribute ---
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urllib.response.addinfourl object.
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auth_cachetriesmaxtriesrI rL rL rM r e s zFancyURLopener.__init__c C s t ||d| |S )z3Default error handling -- don't raise an exception.r' )r r. rL rL rM r k s z!FancyURLopener.http_error_defaultNc C sv | j d7 _ zZ| jrN| j | jkrNt| dr4| j}n| j}|||dd|W S | ||||||}|W S d| _ X dS )z%Error 302 -- relocated (temporarily).rV r http_error_500r z)Internal Server Error: Redirect RecursionN)rB rC r rD r redirect_internal) r rH rh r, r- ri rI r rk rL rL rM r o s
z FancyURLopener.http_error_302c C sx d|kr|d }nd|kr$|d }nd S | t| jd | |}t|}|jdkrnt|||d| ||| |S )Nr r r r z( Redirection to url '%s' is not allowed.)r r r r r r rG ) r rH rh r, r- ri rI r r rL rL rM rE s"
z FancyURLopener.redirect_internalc C s | ||||||S )z*Error 301 -- also relocated (permanently).r r rH rh r, r- ri rI rL rL rM r s z FancyURLopener.http_error_301c C s | ||||||S )z;Error 303 -- also relocated (essentially identical to 302).rF rG rL rL rM r s z FancyURLopener.http_error_303c C s2 |dkr | ||||||S | |||||S dS )z1Error 307 -- relocated, but turn POST into error.N)r r rG rL rL rM r s z FancyURLopener.http_error_307Fc
C s d|kr t | ||||| |d }td|} | sHt | ||||| | \}
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dkrtt | ||||| |st | ||||| d| j d } |dkrt| | || S t| | || |S dS )z_Error 401 -- authentication required.
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dkrtt | ||||| |st | ||||| d| j d } |dkrt| | || S t| | || |S dS )zeError 407 -- proxy authentication required.
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z%FancyURLopener.retry_https_basic_authr c C s` |d | }|| jkr2|r(| j|= n
| j| S | ||\}}|sJ|rX||f| j|< ||fS )Nr )rx rA prompt_user_passwd)r rz r9 r r r r1 rL rL rM rP s
z FancyURLopener.get_user_passwdc C sX ddl }z.td||f }| d|||f }||fW S tk
rR t Y dS X dS )z#Override this in a GUI environment!r Nz Enter username for %s at %s: z#Enter password for %s in %s at %s: r< )getpassinputKeyboardInterruptprint)r rz r9 rY r r1 rL rL rM rX ) s
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_ftperrorsr r )r rL rL rM r7 L s r7 c C s t dkrtda t S )z%Return an empty email Message object.Nrr )
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zftpwrapper.closec C s2 | | jd8 _| jdkr.| js.| d S )NrV r )rg rb rc rl r rL rL rM ri s zftpwrapper.file_closec C s2 | z| j W n t k
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-r c C s i } t j D ]4\}}| }|r|dd dkr|| |dd < qdt jkrZ| dd t j D ]J\}}|dd dkrd| }|r|| |dd < qd| |dd d qd| S )a Return a dictionary of scheme -> proxy server URL mappings.
Scan the environment for variables named <scheme>_proxy;
this seems to be the standard convention. If you need a
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iN_proxyZREQUEST_METHODr )r[ environr rx r )r& r_ r rL rL rM getproxies_environment s
ro c C s |dkrt }z |d }W n tk
r0 Y dS X |dkr>dS | } t| \}}|dD ]Z}| }|r\|d}| }||ks| |kr dS d| }||s| |r\ dS q\dS )zTest if proxies should not be used for a particular host.
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This function uses the MacOSX framework SystemConfiguration
to fetch the proxy information.
proxy_settings come from _scproxy._get_proxy_settings or get mocked ie:
{ 'exclude_simple': bool,
'exceptions': ['foo.bar', '*.bar.com', '127.0.0.1', '10.1', '10.0/16']
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r fnmatch)AddressValueError IPv4Addressc S sh | d}ttt|}t|dkr<|ddddg d d }|d d> |d d> B |d d> B |d B S )
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Return True if the host should bypass the proxy server.
The proxy override list is obtained from the Windows
Internet settings proxy override registry value.
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s r c C s t S )zReturn a dictionary of scheme -> proxy server URL mappings.
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)r rL rL rL rM getproxies_macosx_sysconfa
s r c C s t }|rt| |S t| S dS )zReturn True, if host should be bypassed.
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r N;Software\Microsoft\Windows\CurrentVersion\Internet Settings ProxyEnableZ ProxyServerr r9 rV z
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proxyOverriderL rL rM proxy_bypass_registry
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r c C s t }|rt| |S t| S dS )zReturn True, if host should be bypassed.
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nturl2pathr4 r3 r r8 r9 r] r r^ r4 r_ r7 r` ra r ro rt r r platformZ_scproxyr r r r r, r5 r r rL rL rL rM <module> s" SP
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