![]() ![]() Should any other errors occur, such as network errors, we return an error and exit early. The https client also has an error event that we can listen for. When the file stream is closed, we call the next() function to move on to the next middleware function. We can check if the file stream is closed by listening for the close event. When the web response is complete, the file stream is closed. This means that the web response will be written to the file stream. If the web call was successful, we pipe the web response to the file stream. Note that by calling res.send early, we prevent the next middleware function from being called. Therefore, if the status code is less than 200 or greater than 299, we can return an error and exit early. By convention, web servers should return an OK code, which is generally a code within the 200-299 range. A simple (but not totally foolproof) way of checking if the call was successful is to check the status code. We can check this web response object webRes to see if the web call was successful. The callback function passes a web response object to the callback. The second argument is a callback function that is called when the web call is complete. The first argument to this function is the URL to download the image from. We use the built-in https module, using its get() function to make the web call. Notice that we combine the identifier we added to the req, along with the word background to make a unique filename. The argument to this function is the path to the file we want to write to. We'll use the fs module to create the file stream, using the createWriteStream() function. Then we create a file stream to write the image to. Here we retrieve the URL of the image to download from the req object. get ( "/", [ function ( req, res, next ) We can initialize a new Node.js project by typing the following in the terminal:Īpp. ![]() Start by cloning the new GitHub repo onto your local computer and navigate to that directory in a terminal (or command prompt, if you're on Windows). We're calling the repo image-api here, but you can call it whatever you like. Head over to GitHub and create a new repository. We need a place to store our code and from which Code Capsules can deploy to a capsule. With our requirements in place, we can get started on setting them up to work as needed for our web file project. This tutorial was made using Visual Studio Code, but feel free to use any tool you like. An IDE or text editor to create the project in.Git installed and set up, and a registered GitHub account.You'll need the following services and software set up for this tutorial: In this tutorial, we'll build an HTTP REST API to create composite images for social media. We can automate the task to give us free time to do other things, like more programming! Luckily, some programming knowledge can help us out. While creating this type of image can be done fairly easily with a graphics app, it can quickly become boring and tedious if you need to do it often. Often the final file combines a template image with some headline text and a logo. Game Catalogue API with Node.js and MySQLīuilding an Image Overlay API with ExpressĬreating graphics for social media is a common task. Stripe Checkout and Email Subscription with Flask ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |