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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 that 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
IOError); 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 --
Request -- an object that encapsulates the state of a request. the
state can be a simple as the URL. it can also include extra HTTP
headers, e.g. a User-Agent.
BaseHandler --
exceptions:
URLError-- a subclass of IOError, individual protocols have their own
specific subclass
HTTPError-- also a valid HTTP response, so you can treat an HTTP error
as an exceptional event or valid response
internals:
BaseHandler and parent
_call_chain conventions
Example usage:
import urllib2
# set up authentication info
authinfo = urllib2.HTTPBasicAuthHandler()
authinfo.add_password('realm', 'host', 'username', 'password')
proxy_support = urllib2.ProxyHandler({"http" : "http://ahad-haam:3128"})
# build a new opener that adds authentication and caching FTP handlers
opener = urllib2.build_opener(proxy_support, authinfo, urllib2.CacheFTPHandler)
# install it
urllib2.install_opener(opener)
f = urllib2.urlopen('http://www.python.org/')
N( s StringIO( s unwraps unquotes splittypes splithosts
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The opener will use several default handlers, including support
for HTTP and FTP.
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default handlers, the default handlers will not be used.
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This is called by the http_error_30x methods when a
redirection response is received. If a redirection should
take place, return a new Request to allow http_error_30x to
perform the redirect. Otherwise, raise HTTPError if no-one
else should try to handle this url. Return None if you can't
but another Handler might.
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d } n | d | !} t | \ } } | d j o t | \ } } n d } } | | | | f S( s3 Return (scheme, user, password, host/port) given a URL or an authority.
If a URL is supplied, it must have an authority (host:port) component.
According to RFC 3986, having an authority component means the URL must
have two slashes after the scheme:
>>> _parse_proxy('file:/ftp.example.com/')
Traceback (most recent call last):
ValueError: proxy URL with no authority: 'file:/ftp.example.com/'
The first three items of the returned tuple may be None.
Examples of authority parsing:
>>> _parse_proxy('proxy.example.com')
(None, None, None, 'proxy.example.com')
>>> _parse_proxy('proxy.example.com:3128')
(None, None, None, 'proxy.example.com:3128')
The authority component may optionally include userinfo (assumed to be
username:password):
>>> _parse_proxy('joe:password@proxy.example.com')
(None, 'joe', 'password', 'proxy.example.com')
>>> _parse_proxy('joe:password@proxy.example.com:3128')
(None, 'joe', 'password', 'proxy.example.com:3128')
Same examples, but with URLs instead:
>>> _parse_proxy('http://proxy.example.com/')
('http', None, None, 'proxy.example.com')
>>> _parse_proxy('http://proxy.example.com:3128/')
('http', None, None, 'proxy.example.com:3128')
>>> _parse_proxy('http://joe:password@proxy.example.com/')
('http', 'joe', 'password', 'proxy.example.com')
>>> _parse_proxy('http://joe:password@proxy.example.com:3128')
('http', 'joe', 'password', 'proxy.example.com:3128')
Everything after the authority is ignored:
>>> _parse_proxy('ftp://joe:password@proxy.example.com/rubbish:3128')
('ftp', 'joe', 'password', 'proxy.example.com')
Test for no trailing '/' case:
>>> _parse_proxy('http://joe:password@proxy.example.com')
('http', 'joe', 'password', 'proxy.example.com')
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d n d } | f S( NR< c C s t i | i S( N( t md5R t xR7 ( RJ ( ( R R s t SHAc C s t i | i S( N( R3 R RJ R7 ( RJ ( ( R R s c s d | | f S( Ns %s:%s( R? R t d( R RL ( R? ( R R s ( R; R? R@ ( R R; R? R@ ( ( R? R R> s
c C s d S( N( R ( R R R/ ( ( R RA s ( R R R R R& R R) R9 R0 R> RA ( ( ( R R# V s
9
t HTTPDigestAuthHandlerc B s t Z d Z d Z d Z RS( s An authentication protocol defined by RFC 2069
Digest authentication improves on basic authentication because it
does not transmit passwords in the clear.
R c C s? t i | i d } | i d | | | } | i | S( Ni s www-authenticate( R R R: R R R R" t retryR& ( R R R R R R" R RN ( ( R R s
( R R R R R ( ( ( R RM s t ProxyDigestAuthHandlerc B s t Z d Z d Z RS( Ns Proxy-Authorizationc C s2 | i } | i d | | | } | i | S( Ns proxy-authenticate( R RB R R R R" RN R& ( R R R R R R" R RN ( ( R R s
( R R R R ( ( ( R RO s t _WrapForRecvc B s t Z d Z d Z d Z RS( se Simple wrapper for urllib2 so we don't have to do r.read = r.recv and
create circular refs. c C s
| | _ d S( N( t objR t _WrapForRecv__obj( R RQ ( ( R R s c C s' | d j o
d } n t | i | S( Nt recvR ( R/ R1 R RR ( R R/ ( ( R R3 s
( R R R R R3 ( ( ( R RP s t AbstractHTTPHandlerc B s/ t Z d d Z d Z d Z d Z RS( Ni c C s
| | _ d S( N( t
debuglevelR t _debuglevel( R RU ( ( R R s c C s
| | _ d S( N( t levelR RV ( R RW ( ( R t set_http_debuglevel s c
C s8 | i } | p t d n | i ob | i } | i d p | i d d n | i d p | i d d t | q n t
| i \ } } t | \ } } | i d p | i d | p | n xJ | i i D]< \ } } | i } | i | p | i | | q q W| S( Ns
no host givens Content-types! application/x-www-form-urlencodeds Content-lengths %dt Host( R` RB R R
R6 R9 R RK RI R R; RC R t selR? t sel_hostt sel_pathR R RV R/ R% RH (
R R` RZ R/ R R% R\ R R R[ ( ( R t do_request_ s(
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| i | i | i | | i } Wn$ t i j
o } t | n Xt | } t i | } t | | i | i } | i | _ | i | _ | S( s Return an addinfourl object for the request, using http_class.
http_class must implement the HTTPConnection API from httplib.
The addinfourl return value is a file-like object. It also
has methods and attributes including:
- info(): return a mimetools.Message object for the headers
- geturl(): return the original request URL
- code: HTTP status code
s
no host givenRv t
ConnectionN( R RB R R
t
http_classR t set_debuglevelR RV R R" RP R' R` R7 RC R t getresponseR t socketR] t errRP t _fileobjectR R R R: R2 t statusR R (
R R_ R R Rc R R" R R R2 ( ( R t do_open& s(
% ( R R R RX R] Rf ( ( ( R RT s R c B s t Z d Z e i Z RS( Nc C s | i t i | S( N( R Rf R t HTTPConnectionR ( R R ( ( R t http_open] s ( R R Rh RT R] t http_request( ( ( R R [ s R R c B s t Z d Z e i Z RS( Nc C s | i t i | S( N( R Rf R t HTTPSConnectionR ( R R ( ( R t
https_opene s ( R R Rk RT R] t
https_request( ( ( R R c s t HTTPCookieProcessorc B s2 t Z d d Z d Z d Z e Z e Z RS( Nc C s* | d j o t i } n | | _ d S( N( t cookiejarR R) t CookieJarR ( R Rn ( ( R R k s
c C s | i i | | S( N( R Rn t add_cookie_headerR` ( R R` ( ( R Ri p s c C s | i i | | | S( N( R Rn t extract_cookiesR_ R` ( R R` R_ ( ( R R t s ( R R R R Ri R Rl R ( ( ( R Rm j s
R c B s t Z d Z RS( Nc C s | i } t d | d S( Ns unknown url type: %s( R R> R R
( R R R ( ( R R | s ( R R R ( ( ( R R { s c C sp h } xc | D][ } | i d d \ } } | d d j o" | d d j o | d d !} n | | | <q
W| S( s> Parse list of key=value strings where keys are not duplicated.t =i i t "iN( t parsedt lt eltR( t kt v( Ru Rw Rx Rv Rt ( ( R R- s "c C s g } d } t } } x | D] } | o | | 7} t } q n | oB | d j o
t } q n | d j o
t } n | | 7} q n | d j o | i | d } q n | d j o
t } n | | 7} q W| o | i | n g } | D] } | | i
q ~ S( sp Parse lists as described by RFC 2068 Section 2.
In particular, parse comma-separated lists where the elements of
the list may include quoted-strings. A quoted-string could
contain a comma. A non-quoted string could have quotes in the
middle. Neither commas nor quotes count if they are escaped.
Only double-quotes count, not single-quotes.
R s \Rs t ,N( t rest partRR t escapet quoteR t curRs Rr R R ( R R~ Rz R| R R{ R} ( ( R R. s8
R c B s) t Z d Z d Z d Z d Z RS( Nc C s_ | i } | d d j o1 | d d !d j o d | _ | i i | Sn | i | Sd S( Ni s //i R t ftp( R RC R R R R R t open_local_file( R R R ( ( R t file_open s
% c C sB t i d j o+ t i d t i t i f t _ n t i S( Nt localhost( R t namesR Rb t
gethostbynamet gethostname( R ( ( R t get_names s +c C s d k } | i } | i } t | } t i
| } | i } | i i | i d t }
t i | d } t i t d | p d | |
f } | o t | \ } } n | p$ | o= t i | | i j o! t t! | d | d | Sn t" d d S( Nt usegmti s6 Content-type: %s
Content-length: %d
Last-modified: %s
s
text/plaint rbs file:s file not on local host(# t email.Utilst emailR RB R RC t filet url2pathnamet localfileR t statt statst st_sizet sizet Utilst
formatdatet st_mtimeRs t modifiedt mimetypest
guess_typet mtypet mimetoolst Messaget StringIOR" t splitportR! Rb R R R R R R
( R R R R R! R R R R R R R" ( ( R R s ),( R R R R R R R ( ( ( R R s R c B s t Z d Z d Z RS( Nc C s | i } | p
t d n t | \ } } | d j o
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j o | d j o | i$ } qqW| i% | | \ } } d } t) i* | i+ d } | o | d | 7} n | d j o | d j o | d | 7} n t- | } t/ i0 | } t1 | | | i+ SWn4 t i2 j
o% } t d | f t3 i4 d n Xd S( Ns ftp errors
no host givenR R ii i R t DR t at ARg RL s Content-type: %s
s Content-length: %d
i ( s ftp errors
no host given( R R Rg R RL R (5 R RB R t IOErrorR R! R t ftplibt FTP_PORTRm R R R R RA Rb R R] R R
t splitattrRC R t attrsR( t dirsR R R t connect_ftpt fwR R. t
splitvalueR% R t uppert retrfileR t retrlenR" R R R: R R t sfR R R t
all_errorst syst exc_info( R R R R R R R! R R R R R R R R R R. R% R" R ( ( R t ftp_open sX
c C s t | | | | | } | S( N( t
ftpwrapperR R R R! R R ( R R R R R! R R ( ( R R s ( R R R R ( ( ( R R s 3t CacheFTPHandlerc B s5 t Z d Z d Z d Z d Z d Z RS( Nc C s1 h | _ h | _ d | _ d | _ d | _ d S( Ni i< i ( R t cachet timeoutt soonestt delayt max_conns( R ( ( R R s
c C s
| | _ d S( N( t tR R ( R R ( ( R t
setTimeout s c C s
| | _ d S( N( R R R ( R R ( ( R t setMaxConns" s c C s | | | d i | f } | | i j o t i | i | i
| <n: t | | | | | | i | <t i | i | i
| <| i
| i | S( NR ( R R R! R! R R$ R R R5 R R R R t check_cache( R R R R R! R R$ ( ( R R % s
c C s t i } | i | j oZ xW | i i D]B \ } } | | j o) | i | i | i | =| i | =q, q, Wn t
| i i | _ t | i | i
j oe xF | i i D]5 \ } } | | i j o | i | =| i | =Pq q Wt
| i i | _ n d S( N( R5 R R R R R# Rw Rx R Rv t mint valuesR R ( R Rw R Rx ( ( R R / s"
( R R R R R R R ( ( ( R R s
t
GopherHandlerc B s t Z d Z RS( Nc C s | i } | p t d n t | } | i } t | \ } } t | \ } } t | } | o% t | } t i | | | } n t i | | } t | t | i S( Ns
no host given( R RB R R RA RC t selectort splitgophertypeR t
splitqueryt queryt gopherlibt
send_queryR t
send_selectorR t noheadersR: ( R R R R R R R ( ( R t gopher_openD s ( R R R ( ( ( R R C s t
OpenerFactoryc B sG t Z e e e e e e g Z g Z g Z
d Z d Z d Z
RS( Nc C s | i | g | _ d S( N( R RW R ( R R ( ( R Ru ] s c C s d S( N( ( R R ( ( R t replace_handler` s c C sK t } x; | i D]0 } t i | o
| } n | i | q Wd S( N( RS R R t default_handlerst phR R Ru ( R R R ( ( R R c s
( R R R R R R R R R RW t replacement_handlersRu R R ( ( ( R R U s (U R R R R R R RI R R R R R R R3 Rb R R5 R Rp R) t cStringIOR t ImportErrort urllibR RA R; R? R R R R R R R R R R R R R R RT R R R R R R
R R R RS R R R R R R R R R R R R R R R" R# RM RO RP RT R R0 R Rm R R- R. R R R R R (M R RA R R- R R R R R? R R R RM R R R R R R R R R; R R R R R Rm R R R R R R R R RP R R
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