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vineesha podugu 7vineesha podugu 7 

when I am making a callout in salesforce I am getting 404 not found, but i am getting the response in postman

I am trying to make a callout in salesforce , then I am getting response as 404 not found. when i am doing the same thing in Postman I am getting the response.

could any one suggest where i am going wrong.

here is my class:
public class housingcallout {
    public static void sendhousingCalloutREST(){
        Housing_creds__c data = Housing_creds__c.getvalues('housingcreds'); 
        Hash_Code__c data1 = Hash_Code__c.getvalues('hashcreds'); 
        Manditory_Fields__c data2 = Manditory_Fields__c.getvalues('Hard Coded Fields');
        lead CreateLead = new lead();
        list<lead> newLeads = new list<lead>();
        DateTime Yesterday = DateTime.now()-1;
        HousingWrapper JsonRec = new HousingWrapper();
        JsonRec.start_date = ''+Yesterday.getTime()/1000;
        JsonRec.hash = data1.Hash__c;
        JsonRec.end_date = data2.end_date__c;
        JsonRec.current_time = data1.Current_time__c;
        JsonRec.id = data2.Param_Id__c;
        JSONGenerator gen = JSON.createGenerator(true);
        gen.writeStringField('start_date', JsonRec.start_date);
        gen.writeStringField('end_date', JsonRec.end_date);
        gen.writeStringField('current_time', JsonRec.current_time);
        gen.writeStringField('hash', JsonRec.hash);
        gen.writeStringField('id', JsonRec.id);
            String endPointURL = data.url__c;
            String userName = data.username__c;
            String password = data.password__c;
            // Specify the required user name and password to access the endpoint 
            // As well as the header and header information 
            Blob headerValue = Blob.valueOf(userName + ':' + password);
            String authorizationHeader = 'BASIC ' + EncodingUtil.base64Encode(headerValue);
            Httprequest request = new HttpRequest();
            Http http = new Http();
            request.setHeader('Content-Type', 'application/json');
            // Header info with remote server user name and password
            request.setHeader('Authorization', authorizationHeader);
            // timeout in milliseconds       
            string jsonString = gen.getAsString();
            system.debug('string '+jsonString);
            system.debug('request' + request);
            //Making call to external REST API
            HttpResponse response = http.send(request);
            system.debug('status code '+response.getStatusCode());
            if(response.getStatusCode() == 200){
                list<leadsuccessWrapper> LeadList = new list<leadsuccessWrapper>();
                LeadList = (list<leadsuccessWrapper>)system.json.deserialize(response.getBody(), list<leadsuccessWrapper>.class);
                System.debug('responseBody: '+response.getBody());
                for(leadsuccessWrapper LeadAssign:LeadList){
                    CreateLead.ProjectSelectedDate__c = datetime.newInstance(LeadAssign.lead_date*1000);
                    CreateLead.LastName = LeadAssign.lead_name;
                    CreateLead.Email = LeadAssign.lead_email;
                    CreateLead.Phone = LeadAssign.lead_phone;
                    CreateLead.CountryCode = LeadAssign.country_code;
                    CreateLead.Project_id__c = LeadAssign.project_id;
                    CreateLead.Portal_Project_Name__c = LeadAssign.project_name;
                    CreateLead.Project_Location__c = LeadAssign.locality_name;
                    CreateLead.City = LeadAssign.city_name;
                    CreateLead.Status = data2.Enquiry_Status__c;
                    CreateLead.EnquirySubSource__c = data2.Enquiry_Source__c;
                    insert newLeads;
        }catch(Exception e){
    public class HousingWrapper {
        public string Start_date;
        public string end_date;
        public string current_time;
        public string id;
        public string hash;
    public class leadsuccessWrapper{
        public integer lead_date;
        public String lead_name;
        public String lead_email;
        public String lead_phone;
        public String country_code;
        public string project_id;
        public String project_name;
        public String locality_name;
        public String city_name;