Science & Technology

#15 Spring Web Http methods GET and POST

📚 Main topics

REST API methodsREST APIs use HTTP methods to perform CRUD operations: GET to read, POST to create, PUT to update, and DELETE to remove data. 1:02
Testing with PostmanPostman can send requests using different HTTP methods and display the response body, headers, status code, response time, and data size. 2:35
Fetching one productA path variable lets the controller receive a product ID from the URL and ask the service layer to find the matching product. The example uses a Java stream, filter, and findFirst. 5:11
Adding a productThe POST endpoint receives JSON in the request body, which Spring and Jackson convert into a Java object before the service adds it to the product list. 12:24

✨ Key takeaways

URL and method distinguish requestsGET and POST can use the same products URL because the HTTP method determines which controller mapping handles the request. 14:27
Path variables and request bodiesUse a path variable for values included in the URL and a request body for JSON data sent by the client. 10:21
Status codes help diagnose requestsA 200 response indicates success, a 404 indicates a resource was not found, and 400- and 500-series codes indicate client-side and server-side errors, respectively. 3:37

🧠 Lessons learned

Handle missing products deliberatelyA missing product may cause an error; returning a dummy product is shown as one possible workaround, but not the best solution. 11:23
Use a mutable listThe original list could not accept added products, so the example replaces it with a mutable ArrayList. 17:33
Data is not persistedProducts added to the in-memory list disappear when the application restarts because they are not stored in a database. 20:08

🏁 Conclusion/next steps

What the tutorial coversThe video demonstrates GET requests for retrieving all products or one product, and POST requests for adding a product with Postman. 20:08
Next videoThe instructor plans to demonstrate PUT and DELETE requests in the next video. 20:38

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Transcript excerpt

0:00 so basically we were able to get the products right so if I go back to the browser and if I hit the URL for the products it will give you the list of products of course I can pretty it and you you will get in this format now basically you got all the thing which is your server return to the client of course the data now basically we fetching everything right and that's what you can see here what if you want to fetch one what if you want to add something in this list now this is something we are going to do in this video but before we do that

0:30 uh I want to talk about the other type of API tool which you can use not just your browser because see when you talk about rest API and if you want to basically work with data what we normally do with data is we send data so you have your client here and then this client will send data from uh client to server then it will also accept data from server to client what we are doing here is basically we are sending the data from server to client right but we do certain other things as well we send data from client to server right to

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