The localhost page isn’t working localhost is currently unable to handle this request in cakephp 3.4 - cakephp-3.0

I'm using apache server to run my cakephp 3.4 version application on ubuntu, I'm getting strange problem as below
The localhost page isn’t working
localhost is currently unable to handle this request.
HTTP ERROR 500
But It's working fine in 3.3 version app. does anyone have idea about it?

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#8192 internal error in yii2

I made this project on localhost in xampp with yii2. the project works correctly in localhost but after upload it to host, I got bellow error:
errror #8192
Internal server error.
The above error occurred while the Web server was processing your request.
This page does't helped me.
I really need help to solve this problem.

getting GET http://localhost:3000/load net::ER_CONNECTION_REFUSED in google chrome console

Am running a node server with angular js to fetch a data from MySQL database table, its working absolutely fine in my local system
But I am accessing the same project via simplehttp server in other machine (ubuntu OS in chromium browser) like http://192.168.1.4/Desktop/Clients/my-folder/my-file am getting the following error in browser console
GET http://localhost:3000/load net::ER_CONNECTION_REFUSED
I just searched a lot in google but I did not found any answers still now, please help me to solve this issues

Testing HTML5 offline manifest on tomcat localhost

I am trying to test offline feature of my HTML5 / Java application. I can imagine 2 ways to simulate that locally.
I turn of the wi-fi / internet of my laptop. But localhost 0 127.0.0.1 doesn't have anything to do with internet and it still keeps serving my request.
I stop the tomcat. In this case I get the standard browser error page (Unable to connect error message).
How could I test this on my local tomcat?
You could try disabling your network adapter. That would probably do it.
Instructions for Windows
Instructions for Linux

Dreamweaver connecting to mysql

I want to build a website using dreamweaver and mysql. I used mamp on mac to communicate with mysql.But when I try to build database connection with my sql, I got this error:
HTTP Error Code 404 File Not Found. Here are some possible reasons for the problem:
1) There is no testing server running on the server machine.
2) The testing server specified for this site does not map to the "http://localhost/LabelSite/_mmServerScripts/MMHTTPDB.php URL."Verify that the URL Prefix maps to the root of the site.
I googled and try a bunch of ways but none of them work.Here is what I've already tried:
1)copying MMHTTPDB.php and mysql.php to /Applications/MAMP/htdocs/LabelSite/_mmServerScripts
2)changing the web url to "http://localhost/8888/LabelSite"
But none of them worked
Here is how I set my site by dreamweaver:
I did select server model to be "PHP MYSQL" on the advanced tag of Servers
Any advice would be appreciated, thanks!
I solved this by changing Web Url in the site's testing servers to
"http://localhost:8888/LabelSite/"
Now I get rid of the error!

Connect to Mysql from Chrome extension

Is it possible to connect to some port on localhost to MySQL and to make SQL queries?
It's intended as a development tool, so the user authenticates to his own db.
I've found:
https://npmjs.org/package/mysql-native-pre
plus
http://blog.iceddev.com/2012-11-05-node-js-in-chrome.html
So, it looks like there is a way to run nodeJs in chrome ext. and there is NodeJS module for MySQL communication.
But that still does not mean, that this particular module will work in Chrome sandbox.
Does anyone have some experience with this? I don't know NodeJS and even Chrome extensions, so before I start digging ...
Thank You.