Invoke WebService using Apex ( with/without Authorization) using Apex

Add your **Endpoint URL** in **remote site settings** as shown

Navigation: Setup -> Security Controls -> Remote site Settings

Save Remote Site settings

lets consider **Apex__gen__class** as **wsdl** generated class

Don't know how to generate **Apex Class** from **WSDL** click here

Initiate Class as follows

```java Apex_gen_class ws = new Apex_gen_class(); ```

if your webservice needs basic authentication, it should go like this

```java // "ws" is an Object of Apex_gen_class, which initiated above

ws.inputHttpHeaders_x = new Map <String, String>();
String b64_string = EncodingUtil.base64Encode(Blob.valueOf('<user_name>:'));
ws.inputHttpHeaders_x.put('Authorization', 'Basic ' + b64_string);

// donot add this if authentication not need

<li>Successfully authenticated! Now invoke your **webservice methods** as shown</li>

```java
ws.<your_methods_name>(); // pass parameters if method takes arguments

Thats it! now assign method to corresponding data type, like string or List etc.

NOTE: if Authorization not needed simply dont add bullet #6.

Summary

So we have learned,

1. How to create Remote Site Settings
2. Generation of Apex Class from WSDL
3. Iniatiation
4. Basic Authorization
5. webservice methods invoking