- Why we need this interface ? To communicate between two different Language.
- API means HTTP.
- API is of REST & HTTP.
- Fast API Tool --> its a framework in Python.
- Its just a medium.
- No validation takes place here.
Protocols
- Set of rules or conditions.
- Rules ? Based on the rules , the protocol will be defined.
- We are going to communicate using HTTP Protocol only.
- why we need follow ? If you follow , you will get the desired standard.
Methods
- Hitting a GET request URL for testing purpose and you will get an output like below:
- These outputs are maintained in the table structure.
- If you are developing an API , if you can some standard via REST then it will be best in industry.
- API as many categories like SOAP , REST , GRPC.
- All these going to transfer only in HTTP Protocol.
- Console Window --> Control + Shift + C
- Cookie --> will have the details of the user.
- Why not state-full ? It will be like residing in the same machine ,if you use stateless then it can go to any server , because the service may be hosted in many servers. It won't be in a single server.
- State-full --> In the same machine.
State-less --> if the request goes to another server , this is useful.
There should be some COMMON format --> Data format --> On top of protocol only the data format will be sent. Eg., xml , json
https://www.tutorialspoint.com/xml/index.htm
- Json format is equal to Dictionary in Python. ( nest dictionary & nested list )
Tools
- bruno --> its a open source tool. ( Its a API client Tool )
- Postman
- How to install bruno ?
sudo apt update
sudo apt install bruno
Examples
- Amazon --> ordered in first page and now its went to CART , if the cart doesn't know means , what will happen ? Here comes the HERO is STATELESSNESS ( making no relation between one API to another API is called STATELESSNESS ).
Notes
- https://openweathermap.org/api --> we can invoke this API.
- https://www.rfc-editor.org/info/rfc2616/ --> If you are transferring anything via HTTP , you should follow these rules, also you should use only these networks. All will be defined.
- https://jsonplaceholder.typicode.com/ --> Testing purpose.
- https://www.postman.com/
- https://restfulapi.net/ --> You can find the tutorial.
Commands
- env ( in linux )
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