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  Differences among Enter,F5 and Ctrl+F5 in webpage refresh

When we press Enter, F5 or Ctrl+F5 to refresh a webpage, is there any difference among them? Actually it's yes, we can find the difference from the request header and response header information. There are two cases about pressing Enter in the address bar. First if the page requested is cached and not expired in the browser, we can find the header information sent by the browser is : Host 192.168.3.174:8080 User-Agent Mozilla/5.0 (Windows NT 5.1; rv:5.0) Gecko/20100101 Firefox/5.0 Accept ...

   Refresh,F5,Ctrl+F5     2013-06-13 22:03:35

  Use Delve to debug GoLang program

If you don't know how to debug program, you are not a real programmer. gdb can be used to debug go program, but according to golang website, delve is a better option.   Note that Delve is a better alternative to GDB when debugging Go programs built with the standard toolchain. It understands the Go runtime, data structures, and expressions better than GDB. Below is a simple go program. package main type Person struct { Name string Age int } func main() { var me Person me.Nam...

   GOLANG,DEBUG,DELVE     2018-11-09 23:28:43

  How to check why Vim is slow

On *nix, some processes may not be able to start up, software runs very slowly suddenly and software's "Segment Fault" are some issues faced by many *nix users. Here we show you how to use truss to trace why Vim becomes slow suddenly. Operating system : FreeBSD-5.2.1-releas vim version is 6.2.154, after typing vim on command line, sometimes we need to wait for a few minutes to get into the edit interface and there is no error output. After carefully checking .vimrc and all vim settings, there ar...

   vim, truss, linux     2012-11-26 11:54:35

  Push docker image to remote AWS ECR

With the popularity of distributed and large-scale systems, there are more and more adoptions of cloud services. One of the most popular container in the market is Docker and one of the most popular cloud service provider is AWS. From development perspective, there is frequent need to push local docker image to remote ECR for debugging or testing purpose. Normally when a code change is done and the committed change would go through a series of process like code review, push to remote repo, merge...

   CLOUD,AWS,DOCKER,AWS ECR     2020-12-13 04:12:26

  Memory related exception analysis in Java

Java Virtual Machine Specification divides the memory of JVM into several areas : Heap, Stack, The Program Counter register and Method area etc. In HotSpot JVM, heap is composed of Young, Tenured and Perm. There are different OutOfMemory error can happen in different memory area. Next is an overview of some of these OOM errors. StackOverflowError The JVM will allow only a specified number of stacks created nested. An JVM option -Xss can be set to determine the maximum stack size. If the num...

   Java, Memory model, Memory exception, OOM     2015-01-19 06:54:27

  5 Ways to Boost MySQL Scalability

There are a lot of scalability challenges we see with clients over and over. The list could easily include 20, 50 or even 100 items, but we shortened it down to the biggest five issues we see.1. Tune those queriesBy far the biggest bang for your buck is query optimization. Queries can be functionally correct and meet business requirements without being stress tested for high traffic and high load. This is why we often see clients with growing pains, and scalability challenges as their site becom...

   MySQL,Scalability,Methods,Implementation,Practice     2011-10-18 02:57:27

  Go Error Best Practice

Being indulged in Go for quite a while and having implemented web-related programs, grpc interfaces and Operators, I seem to be an advanced beginner now. However, I am still a raw hand in production-environmental debugging, which is cumbersome if done by querying logs or error messages. Imagine the scenario that a full-text search is called when the specific location of the error log is missing. Then what happens when those error logs are not only in one place? Yes, my error logs can no longer h...

   GO ERROR,ERROR HANDLING     2021-10-07 07:38:28

  10 Easy Things to Do to Enhance Your Online Security Today

If you think you don’t need to take extra steps to increase your cyber security, you are wrong. Statistics on cybercrime are shocking and clearly prove that you can’t have ‘too much security’ while using the Internet today. For example, did you know that by 2023 cybercriminals will have stolen over 33 billion private records or that 15 million Americans became victims of digital identity theft in 2017 (Norton)? That’s not even mentioning millions of monetary losses ...

   DATA SECURITY,SECUIRITY     2019-01-21 07:01:37

  Beginners guide to Linux directory structure

Have you ever looked in your / directory, you’ll see a lot of directories. Here we are presenting beginners guide to linux directory structure explaining what they mean and what are the contents of these directories.Screenshot of contents of root directory: /This is called root partition. All files and directories start with root partition. Write privileges under this directory are avaible with root user only. Not to confuse it with root user’s home directory, know the ...

   Linux,File system structure,Beginner's guide     2012-04-20 12:19:32

  Haxe: Another multiplatform language

There are two kinds of programmers: One is using different languages to solve problems, the other is inventing languages to solve problems. Haxe is an emerging open source programming language which is universal, powerful and easy-to-use. Some languages claimed they were multiplatform languages, such as Java, C# and ActionScript. They all are based on some platforms, Java has JVM, C# has .Net and ActionScript has Flash Player. While Haxe is a trule multiplatform language, it can be used to devel...

   Haxe,Multiplatform,Open source     2012-06-11 08:08:28

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