Salesforce - Simple Apex Rest Callout Pattern

This design pattern was thinking of Salesforce to improve the organization of external calls built on Apex. And it helped me out there to improve the simplicity of building a callout call.

Example

Map<String,List<String>> parameters = new Map<String,List<String>>();
Map<String,String> headers = new Map<String,String>();

parameters.put('parameter', new List<String>{'','','',''});                
headers.put('header', 'header');

CalloutUtils callout = new CalloutUtils();

callout
    .endPoint('http://www.google.com.br')        	      
    .method('POST')            
    .addHeader('Content-Type','application/json')
    .addParameter('parameter1','')
    .addParameter(parameters)
    .addHeader('header1','valueHeader')
    .addHeader(headers)
    .body('body')    
    .timeout(10000);

 HttpResponse res = callout.send();

Description of methods

endPoint(String endpoint) 
Specifies the endpoint for this request - Required

method(String method) 
Sets the type of method to be used for the HTTP request - Required 
(Examples:DELETE,GET,HEAD,POST,PUT,TRACE) - Required

addHeader(String key,String body) 
Adds a header in the request. 

addHeader(Map<String,List<String>> collectionHeaders)
Adds one or more header through the request.

addParameter(String key,String value)
Adds a parameter to the URL
Example:http://requesturl.com/myendpoint?key=value

addParameter(Map<String,List<String>> collectionParameters) 
Dynamically adds the parameters in the URL, respecting the other values ​​added.
Example:http://requesturl.com/myendpoint?key1=Apex,SFDC,Rest

addParameterBody(String key,String value)
Adds a parameter to the Body - Multipart Form Data
Example:Body:"key=value&key=value"

addParameterBody(Map<String,List<String>> collectionParameters) 
Dynamically adds the parameters in the Body, respecting the other values ​​added -  Multipart Form Data
Example:Body:"key1=Apex,SFDC,Rest"

body(String body)
Adds in the request body. (Example: String Json, String xml)

send()
Performs the construction and call of the requisition.

Author

Bruno Smith Lopes Ribeiro - Salesforce Developer - bruno_smith10@hotmail.com

Contributors

Allan Oricil - Salesforce Consultant

Sources

https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_classes_restful_http.htm https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_classes_restful_http_httprequest.htm#apex_classes_restful_http_httprequest https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_classes_restful_http_httpresponse.htm#apex_classes_restful_http_httpresponse https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_classes_restful_http_http.htm#apex_classes_restful_http_http