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Servlet for serving static content

...;url-pattern>/</url-pattern> </servlet-mapping> This basically just maps all content files by extension to the default servlet, and everything else to "myAppServlet". It works in both Jetty and Tomcat. s...
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Wrapping synchronous code into asynchronous call

... in ASP.NET application, that consumes quite a lot of time to complete. A call to this method might occur up to 3 times during one user request, depending on the cache state and parameters that user provides. Each call takes about 1-2 seconds to complete. The method itself is synchronous call to the...
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What is the use case of noop [:] in bash?

... to do. while keep_waiting; do : # busy-wait done The : builtin dates all the way back to the Thompson shell, it was present in Unix v6. : was a label indicator for the Thompson shell's goto statement. The label could be any text, so : doubled up as a comment indicator (if there is no goto comm...
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The 'Access-Control-Allow-Origin' header contains multiple values

...rties.Settings.Default.Cors, "", "")) as well as app.UseCors(CorsOptions.AllowAll); on the server. This results in two header entries. Just use the latter one and it works. share | improve this a...
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Is file append atomic in UNIX?

...ger (linux seems to have it set to 4096). This assume that you're talking all fully POSIX-compliant components. For instance, this isn't true on NFS. But assuming you write to a log file you opened in 'O_APPEND' mode and keep your lines (including newline) under 'PIPE_BUF' bytes long, you should ...
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How do you pass arguments to define_method?

... your defined method accepts arguments. When you define a method you're really just nicknaming the block and keeping a reference to it in the class. The parameters come with the block. So: define_method(:say_hi) { |other| puts "Hi, " + other } ...
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How can I echo HTML in PHP?

I want to conditionally output HTML to generate a page, so what's the easiest way to echo multiline snippets of HTML in PHP 4+? Would I need to use a template framework like Smarty? ...
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Error type 3 Error: Activity class {} does not exist

...the Build directory Restarted Android Studio Rebuild the Project Run Optionally (Go to the files menu on android, click on "Invalidate Caches / Restart..." uninstall the app on your phone and try again) And everything worked fine! I think the key is to restart your IDE. Hope this helps you or a...
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How to find if a native DLL file is compiled as x64 or x86?

... You can use DUMPBIN too. Use the /headers or /all flag and its the first file header listed. dumpbin /headers cv210.dll 64-bit Microsoft (R) COFF/PE Dumper Version 10.00.30319.01 Copyright (C) Microsoft Corporation. All rights reserved. Dump of file cv210.dll PE ...
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PDO MySQL: Use PDO::ATTR_EMULATE_PREPARES or not?

...er using the binary protocol. In other words, the same PDO code will be equally vulnerable (or not-vulnerable) to injection attacks regardless of your EMULATE_PREPARES setting. The only difference is where the parameter replacement occurs--with EMULATE_PREPARES, it occurs in the PDO library; without...