This is how I do it

1. Make HTTP

2. Send HTTP via TCP

3. Perform text processing on the response body (I create own SERP instead of using Google's)

Personally, I use multiple programs, some I wrote myself in C, to perform these individual steps, connected by UNIX pipes and the shortest, simplest possible Bourne shell scripting

However there are countless ways to perform these steps in wide variety of programming languages; there is no need for UNIX or shell scripting, it is purely personal preference