Welcome to Techcoil

Technologies coil to form a greater whole, thereby facilitating the exchange of information between people.

That was how Techcoil was named. Launched in 2010, Techcoil was designated to serve as a memory lane, as well as a testing ground for web related technologies.

We have articles to some technical problems, book recommendations for reading pleasure and self-improvement and some tools to help make some work a little faster.

Latest blog posts

How to send an HTTP request to a HTTP Basic Authentication endpoint in Java without using any external libraries

One common task for Java developers is to write codes that communicate with API endpoints. Chances are these endpoints could use HTTP Basic Authentication for authenticating the HTTP request sender.

Although there are good libraries to help us craft and send HTTP requests to a web server in Java, I prefer to use the Java core library so as to keep my Java program lightweight.

Referencing my earlier post on how to construct a HTTP request to an endpoint with HTTP basic authentication, this post documents how to send an HTTP request to a HTTP Basic Authentication endpoint in Java without using any external libraries.

Setting up WordPress on Raspberry Pi Zero W with Raspbian Stretch Lite, nginx, MariaDB and PHP as the LEMP stack

A Raspberry Pi Zero W is a small and capable computer that included a Wi-Fi chip for projects that requires an Internet connection.

Apart from running client programs on the Raspberry Pi Zero W, it is equally capable of being a web server. Since I had a spare Raspberry Pi Zero W lying around the house, I decided to use it as a WordPress server to collect content for a new blog project.

This post documents how I setup WordPress on a Raspberry Pi Zero W with Raspbian Stretch Lite, nginx, MariaDB and PHP as the LEMP stack.

How to construct a HTTP request to an endpoint with HTTP basic authentication

The HTTP basic authentication is a mechanism commonly used by web servers to authenticate the sender of a HTTP request. Such a mechanism is usually used to guard server endpoints that are meant to be accessed programmatically.

Almost every new project that I got my hands on required me to create client side coding for accessing server endpoints that use HTTP basic authentication for authenticating the HTTP request sender.

To have a quick reference on how to construct a HTTP request to an endpoint with HTTP basic authentication, I created this post to as a documentation. The steps are agnostic to any programming languages.

Latest proof of concepts

Proving that we can use jQuery to push a dynamically generated file to the web browser based on the user's input

In order to demonstrate the possibility of using JavaScript/jQuery to push a dynamically generated file from the server backend to the browser, a sample scenario was created.

There is a number dial that changes rapidly and a text field for the user to enter his name. When the user clicks on the "get lucky number" button, jQuery is used to send the lucky number on the number dial and the user name to the server.

The server generates a text file based on the input from the user and sends the file back to the browser. The browser will then show a download dialog box for the user to decide whether to save a copy of the file or view the file using one of the native applications found in his/her computer.