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How to Call an REST endpoint with basic auth from salesforce?

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In order to call an external server, we have to add the URL in Remote Site Settings. Click Setup > Security Controls > Remote Site Settings > New Add external site name and endpoint URL Site:cheenath endpoint url:https://yourendpoint.details/

public with sharing class ServiceClass {

    private final String AUHT_KEY = 'AUHT_KEY';
    private final String AUTH_USERNAME = 'AUTH_USERNAME';
    private final String AUTH_PASSWORD = 'AUTH_PASSWORD';
    private final String BASE_URL = 'BASE_URL';

	public Map myMethod(String requestUri,String requestBody){
		HttpRequest req = this.getRequest(requestUri);
		req.setBody(requestBody);

		Http h = new Http();
		HttpResponse response = h.send(req);
		Map jsonMap = (Map) JSON.deserializeUntyped(response.getBody());
		return jsonMap;
	}

	private HttpRequest getRequest(String endpoint) {

        Blob headerValue = Blob.valueOf(AUHT_KEY + '\\' + AUTH_USERNAME + ':' + AUTH_PASSWORD);
        String authHeader = 'BASIC ' + EncodingUtil.base64Encode(headerValue);

        HttpRequest req = new HttpRequest();
        req.setEndpoint(BASE_URL + endpoint);
        req.setMethod('POST');
        req.setHeader('Authorization', authHeader);
        req.setHeader('Accept', 'application/json');
        req.setHeader('Content-Type', 'application/json');
        return req;
    }
}

Now we can call the rest endpoint as

ServiceClass myService = new ServiceClass();
Map objResponse = myService.myMethod('getWebLead','{"LeadId":"12345"}');
System.debug(objResponse);