How Do You Call a Web Server?

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Heather Bennett

Calling a web server is an essential part of web development. It allows us to retrieve data from a remote server and display it on our websites. In this article, we will explore different methods of calling a web server using HTML.

1. Using Hyperlinks

If you want to call a web server and navigate to a specific page, you can use hyperlinks. Hyperlinks are created using the tag in HTML. Let’s see an example:

<a href="http://www.example.com">Click here to visit Example.com</a>

This code creates a hyperlink that, when clicked, will call the web server at “http://www.com” and navigate the user to that page.

2. Making HTTP Requests

If you need to retrieve data from a web server without navigating away from your current page, you can make HTTP requests using JavaScript or other programming languages. These requests can be either GET or POST requests.

GET Requests

A GET request is used to retrieve data from the server. In JavaScript, you can use the XMLHttpRequest object or the newer Fetch API to make GET requests.

// Using XMLHttpRequest
var xhr = new XMLHttpRequest();
xhr.open('GET', 'http://www.com/api/data', true);
xhr.onreadystatechange = function() {
  if (xhr.readyState === 4 && xhr.status === 200) {
    var responseData = JSON.parse(xhr.responseText);
    // Process the retrieved data here
  }
};
xhr.send();

// Using Fetch API
fetch('http://www.com/api/data')
  .then(function(response) {
    return response.json();
  })
  .then(function(data) {
    // Process the retrieved data here
  })
  .catch(function(error) {
    console.log(error);
  });

These examples demonstrate how to make GET requests to the web server at “http://www.com/api/data” and retrieve data from it. You can then process this data as needed.

POST Requests

A POST request is used to send data to the server. This is commonly used when submitting forms or performing actions that modify server-side data. Here’s an example of making a POST request using JavaScript:

// Using XMLHttpRequest
var xhr = new XMLHttpRequest();
xhr.open('POST', 'http://www.com/api/submit', true);
xhr.setRequestHeader('Content-Type', 'application/json');
xhr.status === 200) {
    var response = JSON.responseText);
    // Process the response here
  }
};
xhr.send(JSON.stringify({ username: 'JohnDoe', password: 'secret' }));

// Using Fetch API
fetch('http://www.com/api/submit', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({ username: 'JohnDoe', password: 'secret' })
})
.then(function(response) {
  return response.json();
})
.then(function(data) {
  // Process the response here
})
.catch(function(error) {
  console.log(error);
});

In the above examples, we make a POST request to the web server at “http://www.com/api/submit” with some JSON data. The server can then process this data and send a response back, which can be further processed in the JavaScript code.

Conclusion

Calling a web server is an integral part of web development. Whether you need to navigate to a specific page or retrieve/send data, understanding how to call a web server using HTML and JavaScript is crucial. By using hyperlinks or making HTTP requests, you can interact with web servers and create dynamic and interactive web applications.

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