How to call the webservices in lightning component

Question

i have created an webservices in lightning component.but i got a error.please suggest me for code modification

lightning app:

<aura:application >    
     <LightningConect:vinodtestex />
</aura:application>

component:

<aura:component controller="UIviewPageCtrl2" implements="force:appHostable">
    <aura:registerEvent name="sampleComponentEvent" type="testeventex"/>
    <aura:registerEvent name="sampleComponentEvent1" type="testeventtex"/>
    <aura:registerEvent name="sampleComponentEvent2" type="testeventtex1"/>
    <aura:handler name="sampleComponentEvent" action="{!c.handlerAction}"/>
    <aura:handler name="sampleComponentEvent1" action="{!c.stateAction}"/>
    <aura:handler name="sampleComponentEvent2" action="{!c.districtAction}"/>   
     <div class="form-style">
         Postal Code<br/>
    <ui:inputText class="search-text" aura:id="name" maxlength="10" blur="{!c.myAction}"  value=""/>    

    <ui:inputSelect class="dynamic" aura:id="InputSelectSingle" change="{!c.myState}">
        <aura:iteration items="{!jsonStr}" var="contact">
            <ui:inputSelectOption text="{!contact.Name}"/>
        </aura:iteration>
    </ui:inputSelect>

    <ui:inputSelect class="dynamic" aura:id="InputSelectSinglestate" change="{!c.myDistrict}">
        <aura:iteration items="{!v.state}" var="state">
            <ui:inputSelectOption text="{!state.Name}"/>
        </aura:iteration>
    </ui:inputSelect>
    <ui:inputSelect class="dynamic" aura:id="InputSelectSingleDistrict">
        <aura:iteration items="{!v.district}" var="district">
            <ui:inputSelectOption text="{!district.Name}"/>
        </aura:iteration>
    </ui:inputSelect>
   </div>
</aura:component>

controller:

global class UIviewPageCtrl2{
 @AuraEnabled   
    public static list<string> address{set;get;}
    public String Districts { get; set; } 
    public static list<SelectOption> selectedDistricts { get; set; }

    public String states { get; set; }

    public static list<SelectOption> selectedCountrys { get; set; }
    public static list<SelectOption> selectedStates { get; set; }

    public String country { get; set; }

    public static String postalCode { get; set; }

    public static String baseUrl {get; set;}

    public static String apiKey {get; set;}

    public static String url {get; set;}


public UIviewPageCtrl2(){
address = new list<string>();
}
@AuraEnabled
public static List<Country__c> getDosearch(){

    return null;

}
    @AuraEnabled
public static String getCountry(String searchKey) {

    baseURL = 'http://api-adresse.data.gouv.fr/';

    // Sign up for an API key here: http://www.wunderground.com/weather/api/d/login.html
    //apiKey = 'http://api-adresse.data.gouv.fr/search/?q=8%20bd%20du%20port';
    url = 'http://api-adresse.data.gouv.fr/search/?q=34140';
    HttpRequest req = new HttpRequest();
    Http http = new Http();
    req.setMethod('GET');    
    req.setEndpoint(url);
    req.setHeader('Content-Type', 'application/json');
     try {
        HTTPResponse res = http.send(req);
        System.debug('Result---->'+res.getBody());
        return res.getBody();        

    } catch(Exception ex){
        return '{"error": "' + ex.getMessage() + '"}';
    }

}



    //System.debug('testtttt------>'+searchKey);

    //return [SELECT Id,LightningConect__Zip_del__c,Name FROM LightningConect__Country__c where LightningConect__Zip_del__c in (Select id from LightningConect__Pin_Code__c where name=:searchKey)];
    //return null;

    @AuraEnabled
    public static List<state__c> getState(string stateKey) {

        return[SELECT Id,LightningConect__Country__c,Name FROM LightningConect__State__c where LightningConect__Country__c in (SELECT id from LightningConect__Country__c where name=:stateKey)];
    }
    @AuraEnabled
    public static List<district__c> getMatch(string districtKey) {
        return[SELECT Id,LightningConect__State__c,Name FROM LightningConect__District__c where LightningConect__State__c in (SELECT id from LightningConect__State__c where name=:districtKey)];
    }


@AuraEnabled
public void getDosearchstate(){
        selectedStates = new list<SelectOption>(); 
        system.debug('*********country '+country );
         if(country !='' && country !='--None--'){
                list<state__C > l =[select id, name from state__C where country__c=:country];
                for(state__C pc:l){
                     selectedStates.add(new SelectOption(pc.id,pc.name));  
                }
                country__c s =[select name from country__c where id=:country];
                address.add(s.name);
        }else{
                selectedStates = null; 
                 selectedDistricts = null;
                 address.clear();
        }
}
@AuraEnabled
 public  void getDosearchDistricts() {
         selectedDistricts = new list<SelectOption>(); 
        system.debug('*********country '+states );
         if(states !='' && states !='--None--'){

                list<District__c> l =[select id, name from District__c where state__c=:states ];
                for(District__c pc:l){
                     selectedDistricts.add(new SelectOption(pc.id,pc.name));  
                }
                 state__C s1 =[select name from state__C where id=:states ];
                 address.add(s1.name);
        }else{
                selectedDistricts = null; 
                address.clear();
        }
    }
@AuraEnabled
  public void getDosearchadd(){
 if(Districts!='' && Districts!='--None--'){
District__c s2 =[select name from District__c where id=:Districts];
address.add(s2.name);

}else{
 address.clear();
}
}
}