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This course will begin our journey into Application Programming Interface(API) Development with Laravel.  In this course, we will be going over topics like:
- Concept of Application Programming Interface (API)  and its benefits, 
- Representational State Transfer (REST) Architecture and its constraints, 
- JSON Web Token (JWT) for authentication, 
- best practices for designing a RESTful API, and much more.

We will be putting this knowledge into practical use by building a Question & Answer Restful API Application.

Application Features

- Users can signup and sign in.
- Users can reset their passwords.
- Authenticated users can post a question.
- Authenticated users can answer a question.
- The question owner can delete his question.
- Answer owner can delete his answer.

This course requires an understanding of PHP and a basic understanding of the Laravel framework. 

By the end of this course, we will be able to begin our journey in creating RESTful APIs in Laravel.

Building a Question & Answer RESTful API Application

## Introduction

A server issues HTTP response status codes in response to a client's request. The response status code is a standardized three-digit integer, and a client handles the response based primarily on the status code.

## Classes of status codes
There are five categorizations of HTTP response status codes. The first digit of a status code defines the response class, while the last two digits have no categorization.

### 1xx (Informational)
An informational response status code indicates that the request was received and understood, the request is processing, and the client needs to wait for a final response. 

### 2xx (Success)
Response codes in this class indicate that the client's request was received, understood, and accepted. This class's popular status codes include

**200 OK** - Standard response for successful HTTP requests.

**201 Created** - Standard response after creating a resource.

**204 No Content** - The request was successfully processed and will not return any content.

### 3xx (Redirection)
Response codes in this class indicate that the client must take additional action to complete the request, mostly a URL redirection. A popular status code in this class is

**301 Moved Permanently** - This class of status codes indicates that the client should redirect current and all future requests to the given URI.

### 4xx (Client errors)
This class of status codes indicates an error that the client might have caused or a problem with the request. This class's popular status codes include

**400 Bad Request** - The server can not process the request due to malformed request syntax, size too large, or invalid request message framing.

**401 Unauthorized** - Standard response when the server can not complete a request from a client because the client lacks valid authentication credentials for the requested resource. The client is trying to access a resource that requires authentication.

**403 Forbidden** - Standard response when the request is valid and understood, but the server refuses action due to the client not having the necessary permissions or attempting a prohibited activity.

**404 Not Found** - Probably the most popular status code. Standard response when the requested resource could not be found but may be available in the future. 

### 5xx (Server errors)
Response codes in this class indicate that the server has encountered an error or is incapable of performing the request. This class's popular status codes include

**500 Internal Server Error** - Standard response when the server encounters an unexpected condition or error and no specific message is suitable

**503 Service Unavailable** - Standard response when the server cannot handle the request because it is overloaded or down for maintenance


# Introduction

A server issues HTTP response status codes in response to a client's request. The response status code is a standardized three-digit integer, and a client handles the response based primarily on the status code.

# Classes of status codes
There are five categorizations of HTTP response status codes. The first digit of a status code defines the response class, while the last two digits have no categorization.

## 1xx (Informational)
An informational response status code indicates that the request was received and understood, the request is processing, and the client needs to wait for a final response. 

## 2xx (Success)
Response codes in this class indicate that the client's request was received, understood, and accepted. This class's popular status codes include

**200 OK** - Standard response for successful HTTP requests.

**201 Created** - Standard response after creating a resource.

**204 No Content** - The request was successfully processed and will not return any content.

## 3xx (Redirection)
Response codes in this class indicate that the client must take additional action to complete the request, mostly a URL redirection. A popular status code in this class is

**301 Moved Permanently** - This class of status codes indicates that the client should redirect current and all future requests to the given URI.

## 4xx (Client errors)
This class of status codes indicates an error that the client might have caused or a problem with the request. This class's popular status codes include

**400 Bad Request** - The server can not process the request due to malformed request syntax, size too large, or invalid request message framing.

**401 Unauthorized** - Standard response when the server can not complete a request from a client because the client lacks valid authentication credentials for the requested resource. The client is trying to access a resource that requires authentication.

**403 Forbidden** - Standard response when the request is valid and understood, but the server refuses action due to the client not having the necessary permissions or attempting a prohibited activity.

**404 Not Found** - Probably the most popular status code. Standard response when the requested resource could not be found but may be available in the future. 

## 5xx (Server errors)
Response codes in this class indicate that the server has encountered an error or is incapable of performing the request. This class's popular status codes include

**500 Internal Server Error** - Standard response when the server encounters an unexpected condition or error and no specific message is suitable

**503 Service Unavailable** - Standard response when the server cannot handle the request because it is overloaded or down for maintenance


Learn about the different HTTP response status codes and their classes.

Getting Started

Introduction to API Assessment

Quick Refresher

Authentication

Create Question Endpoints

Create Answer Endpoints

Tags

Database Seeding

Password Reset

Conclusion

HTTP Response Codes

Introduction

Classes of status codes

1xx (Informational)