Http callout to an endpoint using Apex

//when the callout endpoint's url and authentication settings are done in the remote settings

HttpRequest req = new HttpRequest(); req.setEndpoint('callout:My_Named_Credential/some_path'); req.setMethod('GET'); Http http = new Http(); HTTPResponse res = http.send(req); System.debug(res.getBody());

if (response.getStatusCode() == 200){

List<Object> results = (List<Object>) JSON.deserializeUntyped(response.getBody());

for(Object result : results){

//code for using the result

}

}

//without remote settings HttpRequest req = new HttpRequest(); req.setEndpoint('https://my_endpoint.example.com/some_path'); req.setMethod('GET'); // Because we didn't set the endpoint as a named credential, // our code has to specify: // - The required username and password to access the endpoint // - The header and header information String username = 'myname'; String password = 'mypwd'; Blob headerValue = Blob.valueOf(username + ':' + password); String authorizationHeader = 'BASIC ' + EncodingUtil.base64Encode(headerValue); req.setHeader('Authorization', authorizationHeader); // Create a new http object to send the request object // A response object is generated as a result of the request Http http = new Http(); HTTPResponse res = http.send(req); System.debug(res.getBody());