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U
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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)
f = urllib.request.urlopen('http://www.python.org/')
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Open the URL url, which can be either a string or a Request object.
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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
certificates for HTTPS requests. cafile should point to a single file
containing a bundle of CA certificates, whereas capath should point to a
directory of hashed certificate files. More information can be found in
ssl.SSLContext.load_verify_locations().
The *cadefault* parameter is ignored.
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manager and has methods such as
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form of an email.message_from_string() instance (see Quick Reference to
HTTP Headers)
* getcode() - return the HTTP status code of the response. Raises URLError
on errors.
For HTTP and HTTPS URLs, this function returns a http.client.HTTPResponse
object slightly modified. In addition to the three new methods above, the
msg attribute contains the same information as the reason attribute ---
the reason phrase returned by the server --- instead of the response
headers as it is specified in the documentation for HTTPResponse.
For FTP, file, and data URLs and requests explicitly handled by legacy
URLopener and FancyURLopener classes, this function returns a
urllib.response.addinfourl object.
Note that None may be returned if no handler handles the request (though
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Retrieve a URL into a temporary location on disk.
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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 | ||||| | \}
} |
dkrtt | ||||| |st | ||||| d| j d } |dkrt| | || S t| | || |S dS )z_Error 401 -- authentication required.
This function supports Basic authentication only.rj ![ ]*([^ ]+)[ ]+realm="([^"]*)"r[ Zretry_ _basic_authNr8 r rf matchrV rx r r
r rH rh r, r- ri rI r ZstuffrK r r9 r_ rL rL rM rk s:
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dkrtt | ||||| |st | ||||| d| j d } |dkrt| | || S t| | || |S dS )zeError 407 -- proxy authentication required.
This function supports Basic authentication only.rm rH r[ Z retry_proxy_rI NrJ rL rL rL rM rn s:
z FancyURLopener.http_error_407c C s t |\}}d| | }| jd }t|\}} t | \} }
| dd } | | d } | | || \} }
| sr|
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z+FancyURLopener.retry_proxy_https_basic_authc
C s t |\}}|dd }||d }| |||\}}|sD|sDd S dt|ddt|dd|f }d| | } |d kr| | S | | |S d S )Nr rV rN rr r rM r r rP r rG
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z$FancyURLopener.retry_http_basic_authc
C s t |\}}|dd }||d }| |||\}}|sD|sDd S dt|ddt|dd|f }d| | } |d kr| | S | | |S d S )Nr rV rN rr r rS rU rV rL rL rM retry_https_basic_auth s
z%FancyURLopener.retry_https_basic_authr c C s` |d | }|| jkr2|r(| j|= n
| j| S | ||\}}|sJ|rX||f| j|< ||fS )Nr )rx rA prompt_user_passwd)r rz r9 r r r r1 rL rL rM rP s
z FancyURLopener.get_user_passwdc C sX ddl }z.td||f }| d|||f }||fW S tk
rR t Y dS X dS )z#Override this in a GUI environment!r Nz Enter username for %s at %s: z#Enter password for %s in %s at %s: r< )getpassinputKeyboardInterruptprint)r rz r9 rY r r1 rL rL rM rX ) s
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c C s t dkrtda t S )z8Return the IP address of the magic hostname 'localhost'.Nr )
_localhostr r rL rL rL rM r 9 s
r c C sP t dkrLzttt d a W n( tjk
rJ ttdd a Y nX t S )z,Return the IP addresses of the current host.Nr: r ) _thishostr8 r r r r rL rL rL rM r4 A s r4 c C s t dkrddl} | ja t S )z1Return the set of errors raised by the FTP class.Nr )
_ftperrorsr r )r rL rL rM r7 L s r7 c C s t dkrtda t S )z%Return an empty email Message object.Nrr )
_noheadersr r rL rL rL rM noheadersU s
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dS )r z;Class used by open_ftp() for cache of open FTP connections.NTc C sX || _ || _|| _|| _|| _|| _d| _|| _z | W n | Y nX d S ro )
r r1 rz rC r rJ refcount keepaliveinitr )r r r1 rz rC r rJ r rL rL rM r b s zftpwrapper.__init__c C s\ dd l }d| _| | _| j| j| j| j | j| j | j
d | j }| j
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C s dd l }| |dkr"d}d}n d| }d}z| j| W n* |jk
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error_permr r r r r pwdrf re r Zmakefile
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$
zftpwrapper.retrfilec C s
d| _ d S ro )re r rL rL rM rg s zftpwrapper.endtransferc C s d| _ | jdkr| d S )NFr )rc rb
real_closer rL rL rM r s
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
r, Y nX d S rN )rg r r r7 r rL rL rM rl s
zftpwrapper.real_close)NT) r r r r r rd r rg r ri rl rL rL rL rM r _ s
-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 _proxy;
this seems to be the standard convention. If you need a
different way, you can pass a proxies dictionary to the
[Fancy]URLopener constructor.
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.
Checks the proxy dict for the value of no_proxy, which should
be a list of comma separated DNS suffixes, or '*' for all hosts.
NZnoF*Tr .)ro r rx r
rX rd lstripr )rz r& Zno_proxyhostonlyrC r_ rL rL rM proxy_bypass_environment s*
rt c C s0 ddl m } t| \}}dd }d| kr4|d r4dS d}|d d
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Return True iff this host shouldn't be accessed using a proxy
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']
}
r )fnmatchc S sh | d}ttt|}t|dkr<|ddddg d d }|d d> |d d> B |d d> B |d B S )
Nrq r r rV r} r: r| rS )rX r r rb rd )ZipAddrrB rL rL rM ip2num
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z,_proxy_bypass_macosx_sysconf..ip2numrq Zexclude_simpleTN
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r~ darwin)_get_proxy_settings _get_proxiesc C s t }t| |S rN )r r~ )rz r| rL rL rM proxy_bypass_macosx_sysconfF
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_sysconfJ
s r c C s t }|rt| |S t| S dS )zReturn True, if host should be bypassed.
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or from the MacOSX framework SystemConfiguration.
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r Y nX | S )zxReturn a dictionary of scheme -> proxy server URL mappings.
Win32 uses the registry to store proxies.
r N;Software\Microsoft\Windows\CurrentVersion\Internet Settings ProxyEnableZ ProxyServerr r9 rV z
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winreg ImportErrorOpenKeyHKEY_CURRENT_USER QueryValueExr rX rf rK ZCloserq rB r )r& r internetSettings proxyEnableZ proxyServerpr ZaddressrL rL rM getproxies_registryf
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t S )zReturn a dictionary of scheme -> proxy server URL mappings.
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or the registry.
)ro r rL rL rL rM r5
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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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N)ro rt r r rL rL rM r,
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r r r r r r r r r Zurllib.responser r rD r rC __all__ version_infor rF r r0 r1 r` r6 r7 rg ASCIIrv r{ r r r2 r r/ r r r" r r r! r" r# r$ r% urandomr r& r' r( r r) r r rE ra r r. rv rx r* r r+ r, r- r6 r_ Z
nturl2pathr4 r3 r r8 r9 r] r r^ r4 r_ r7 r` ra r ro rt r~ platformZ_scproxyr r r r r, r5 r r rL rL rL rM s SP
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