How can I check if the given URL of an image exists using GWT? -

-

i want check if given url exists , it's image, in order create new image(string url) it. if given url not image should return error.

you requestbuilder -- request image url, use response's getheaders() method content type, , check if it's image.


Comments

Post a Comment

Popular posts from this blog

windows - Why does Vista not allow creation of shortcuts to "Programs" on a NonAdmin account? Not supposed to install apps from NonAdmin account? -

-
i'm working on installer (using wise installer, older version 1999). i'm creating shortcut in programs group exe. i'm creating shortcut on desktop. if install run admin account, create shortcut on common desktop , common program group (i.e., read hkey_local_machine\explorer\shellfor users). if it's installed nonadmin account, install hkey_current_user's desktop , program group. behavior install on: xp nonadmin - desktop , program shortcuts install ok. vista admin - desktop & program shortcuts install ok. vista non-admin, uac off - desktop shortcut installs, program shortcut not . however, program group folder they're supposed installed does created. at end of install, launch program group has shorcut. launches in of above. can manually drag shortcut folder , works fine. i'm bloody baffled. i've tried installing other commercial apps (opera, foxit, firefox) firefox install under nonadmin (and if select other program files,...
Read more

c# - Setting Server Bindings of IIS 6.0 Programmatically -

-
i'm trying set installer register web site. currently, i've got creating application pool , web site under windows server 2003. unfortunately, whenever try modify serverbindings property set ip address, throws exception @ me. first tried because documentation here told me http://msdn.microsoft.com/en-us/library/ms525712%28vs.90%29.aspx . i'm using vb.net, c# answers okay need switch on using c# anyway. siterootde.properties.item("serverbindings").item(0) = "<address>" this throws argumentoutofrangeexception. checked it, , server bindings of size 0. when tried create new entry in list this: siterootde.properties.item("serverbindings").add("<address>") i comexception when try that. i looked @ registered property keys, , serverbindings found. however, when create web site through iis, generates serverbindings correctly , can see it. what need serverbindings appear? edit: moved code on c# , tried it. seems re...
Read more

Python + DNS : Cannot get RRSIG records: No Answer -

-
i dns records python program, using dns python i can various dnssec-related records: >>> import dns.resolver >>> myresolver = dns.resolver.resolver() >>> myresolver.use_edns(1, 0, 1400) >>> print myresolver.query('sources.org', 'dnskey') <dns.resolver.answer object @ 0xb78ed78c> >>> print myresolver.query('ripe.net', 'nsec') <dns.resolver.answer object @ 0x8271c0c> but no rrsig records: >>> print myresolver.query('sources.org', 'rrsig') traceback (most recent call last): file "<stdin>", line 1, in <module> file "/usr/lib/python2.5/site-packages/dns/resolver.py", line 664, in query answer = answer(qname, rdtype, rdclass, response) file "/usr/lib/python2.5/site-packages/dns/resolver.py", line 121, in __init__ raise noanswer ...
Read more