Most of the CDN's that I've seen require you to upload your content in advance.  I'm looking for a CDN that, upon receiving a request for a resource it hasn't seen, will contact my application server.  If the application server returns something, it should be sent to the user and then cached in the CDN.  If not, it should just return a 404.  If the user requests an unexpired item, the CDN should just serve it without bothering my app server.  Does anything like this exist?  Is there a way to get Cloudfront to work like this?
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Is there a comma needed before quotation? Is there any point in taking the alternate exits in Bit Trip Runner 2?  I can't see any benefit to doing so in terms of unlocking a different path in the overworld, so is it just for your own benefit? Anyone seen this one yet? Vote too old to be changed, unless post is edited My vote was only a few hours old. Then I realized the answer was wrong. Updated my question and went to remove the vote. Even after updating question I still have the issue. Small issue, but frustrating.  See also: Top posts taken from hidden communities From Edit Profile &amp; Settings, we have below information  Hide Communities  Choose which communities will appear in the Communities and Top Network Posts sections of your profile Hiding a community means other users will not see it in your Communities list or Top Network Posts. It does not, however, mean your activity is private.   So it is clearly mentioned  Hiding a community means other users will not see it in your Communities list or Top Network Posts.  But, I could see the top network posts are taken from hidden communities for ex: I have marked 'Christianity' as a hidden community in . But, the top posts has a question taken from Christianity community &quot;&quot; How to view recently opened media files? In windows we have an option to view recently opened media files as my recent documents, I was  wondering does there exists something like that in Ubuntu?  via terminal or via GUI? How to execute a program or call a system command from Python How do I reboot a Ubuntu Server from the command line? sudo reboot now never seems to work for me. Because its a server, I don't have a window manager installed, so I can't do it from a GUI (which always seems to work).    I've had the problem for years on different versions of the operating system. It happens in virtual machines and on real metal. The same problem exists with sudo shutdown now, too.  I've lived with it in the past. The difference now is I don't want to just hit the power button because I might lose data. Each time I open any application, it zooms to fill-up the entire desktop and so I am always forced to use "Unmaximize" using Alt+Space menu. I am looking for a way to identify primitives types in a template class definition.  I mean, having this class :  template&lt;class T&gt; class A{ void doWork(){    if(T isPrimitiveType())      doSomething();    else      doSomethingElse();  } private: T *t;  };   Is there is any way to "implement" isPrimitiveType(). What mode does the terminal go into when I type a single quote? "NG NS" on ticket after airport security I went through security at the Sacramento Airport with a friend. He got something written on his boarding pass "NG NS". I didn't have that. We both went through the same metal detector, neither beeped nor had random checks. Flying to Edmonton through Seattle connection. Early for flight.  I have tried searching for "what is tsa ng ns" on Google but nothing useful came up. Any ideas? What is the difference between Python's list methods append and extend? OpenGL GLX context is not using direct rendering, which may cause performance problems. (steam) AMD DRIVER When I start steam in a terminal, I get the following error messages   charlie@SteamMPL:~$ steam rm: no se puede borrar «/home/charlie/.steam/steam»: Es un directorio rm: no se puede borrar «/home/charlie/.steam/bin»: Es un directorio Running Steam on ubuntu 14.04 64-bit STEAM_RUNTIME is enabled automatically [2014-08-03 11:50:13] Startup - updater built Jul 15 2014 18:14:26 Installing breakpad exception handler for appid(steam)/version(1405474565_client) libGL error: failed to load driver: swrast Looks like steam didn't shutdown cleanly, scheduling immediate update check Installing breakpad exception handler for appid(steam)/version(1405474565_client) [2014-08-03 11:50:14] Checking for update on startup [2014-08-03 11:50:14] Buscando actualizaciones disponibles... Installing breakpad exception handler for appid(steam)/version(1405474565_client) [2014-08-03 11:50:14] Download skipped: /client/steam_client_ubuntu12 version 1405474565, installed version 1405474565 [2014-08-03 11:50:14] Nothing to do [2014-08-03 11:50:14] Verificando instalación... [2014-08-03 11:50:14] Performing checksum verification of executable files [2014-08-03 11:50:15] Verification complete Gtk-Message: Failed to load module "overlay-scrollbar" Gtk-Message: Failed to load module "unity-gtk-module" Installing breakpad exception handler for appid(steam)/version(1405474565_client) Fontconfig error: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 70: non-double matrix element Fontconfig error: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 70: non-double matrix element Fontconfig warning: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 78: saw unknown, expected number [0803/115015:WARNING:proxy_service.cc(958)] PAC support disabled because there is no system implementation libGL error: failed to load driver: swrast Error: OpenGL GLX context is not using direct rendering, which may cause performance problems.   Hardware information:   CPU: AMD Athlon x4 760k  GPU: AMD Radeon R7 250 1 GB GDDR5 (Driver: Catalyst 14.4) RAM: 8 GB DDR3 1600   What can I do to circumvent this issue? How does ZFC describe addition? Surprisingly, the Wikipedia article on addition doesn't contain the answer. I looked  elsewhere online for it, but didn't find it.   Intuitively, the cardinal of the union of two sets seemed appealing. But that approach doesn't work, given that the union of 2 and 2 is 2. I wondered whether ordered sets might be essential to the answer.   So, how does ZFC describe addition? Print out elements from an array with a comma between elements except the last word How can I get LaTeX to warn about unreferenced figures and unused labels in general? When writing documents, I consider it to be necessary that all figures and tables are referenced (\ref) in the text, whether or not I've remembered to \label them. LaTeX does not currently warn if a figure or table is not referenced. Is there a way to ensure that this is flagged up as a warning?  Note that I am specifically concerned about figures and tables, not chapter or section headings; it will be no good looking just at \labels that don't have an associated \ref.  In other words, it should report boo and not report bla in the following MWE:  \documentclass{article} \begin{document} \section{BLA}\label{bla} \section{BOO}\label{boo} In Section~\ref{bla} we do something. \end{document} align xticks in PGFPlots We're building a feature for a website and trying to think of a hypernym for clients, partners and members so that the feature remains generic enough for re-use later on other websites. It turns out that removing a virtual package with apt-get only remove the package itself,  leaving behind the real packages that were installed by it  So how do you remove a virtual package, along with all the real packages that it installs? Suppose $z\neq -1$ is a complex number of norm 1m $(|z| =1)$. I know that $z= n + mi$, what is the most straightforward way of solving this problem? I was also given the following sketch for a possible approach.