June 2017
Intermediate to advanced
536 pages
9h 49m
English
Content preview from Mastering PHP 7
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Understanding the client-server relationship
To easily visualize the client-server relationship and the request-response type of messaging, we can think of a mobile currency application acting as a client and some remote website, such as http://api.fixer.io/, being the server. The server exposes one or more URL endpoints, allowing communication exchange, such as http://api.fixer.io/latest?symbols=USD,GBP. The mobile application can easily issue a HTTP GET http://api.fixer.io/latest?symbols=GBP,HRK,USD request, which then results in a response like this:
{ "base": "EUR", "date": "2017-03-10", "rates": { "GBP": 0.8725, "HRK": 7.419, "USD": 1.0606 }}
The HTTP GET keyword is used to denote the type of operation we want to perform on the receiver located ...
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