Or if some POST request reveals a vulnerability and some criminal gains access, chances are that you wouldn’t realize until it’s too late. Plain and simple.įor example, if your contact form, say, is not properly secured, it could be possible for spammers to use the form to send out mass emails without your knowledge. This is the primary reason why spammers and other nefarious types spend time and resources endlessly posting their malicious payloads via POST requests: they’re looking for opportunities to exploit, plunder, and steal your online assets. The persistent threat with POST requests, however, is that they may reveal a vulnerability somewhere on the server. Otherwise, POST requests that fail validation or otherwise don’t meet the form requirements will either die quietly or receive a 404 error in response. For example, if you have a contact form and someone is making POST requests, the requests will go through successfully if they meet the requirements specified in the contact script. Server ResponseĮach server has its own specific configuration, but in general, POST requests are handled either successfully or not. So in this article, we’ll learn more about POST requests, how to monitor them, and most importantly how to protect your online assets against malicious POST activity. Over time, the cumulative effect of massive POST requests to your site may be experienced as a slow sucking sound, as server resources and bandwidth are gobbled up by relentless spam scripts and other malicious behavior.Įven worse is the perpetual threat of some snot-nosed loser finding a vulnerability and exploiting your site. To prevent detection and filtering, POST spammers like to convert, encode, and obfuscate their code, which can dramatically increase overall request size. Likewise for other forms or scripts that utilize Ajax - even static HTML sites with absolute zero post-handling are repeatedly probed with malevolent POST requests.Īs we’ll see a bit later in the article, illicit POST requests typically include large amounts of data. For example, if you have a contact form on your site, chances are good that it’s being bombarded with copious volumes of nasty POST spam. So perpetrators can run scripts that make endless POST requests to unsuspecting sites 24 hours a day, 7 days a week, 365 days a year. The problem is that, on a typical server, there are no restrictions on POST requests. Such is perfectly normal and expected part of how the Web works. But whenever you leave a comment, tweet something, or share on Facebook, the browser is sending your content, along with other data, to the server as a POST request. To illustrate, normal surfing around the Web involves your browser making series of GET requests for all the resources required for each web page. Instead of getting some resource or file from the server, data is being posted or sent to it. POST requests are sort of the opposite of GET requests. The second parameter is used to define the body (data to be sent) and type of request to be sent, while the third parameter is the header that specifies the type of data you will send, for example JSON.Whether you like it or not, there are scripts and bots out there hammering away at your sites with endless HTTP “POST” requests. While the other parameters may not be necessary when making a GET request, they are very useful for the POST HTTP request. The FetchAPI is a built-in method that takes in one compulsory parameter: the endpoint (API URL). How to Send a POST Request with the Fetch API There are other methods, such as Axios and jQuery, that you will also learn how to use. These methods are the FetchAPI, based on JavaScript promises, and XMLHttpRequest, based on callbacks. There are two built-in JavaScript methods for making an HTTP POST request that don't require the installation of a library or the use of a CDN. We'll send GET requests to the free JSON Placeholder todos API for this guide. In this article, you will learn the various methods that you can use to send an HTTP POST request to your back-end server in JavaScript. One of the five popular HTTP methods for making requests and interacting with your servers is the POST method, which you can use to send data to a server. HTTP requests allow your front-end application to interact successfully with a back-end server or database.
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