Question 1

Why is HTTP described as a "stateless" protocol, and how does this affect app development?

Accepted Answer

Statelessness means that the server does not remember any information about a user from one request to the next. Every interaction is treated as a completely new conversation, similar to a barista with short-term memory loss who requires you to restate your order every time you approach the counter. While this requires developers to include all necessary context—such as authentication tokens and parameters—in every single "envelope" or request, it is a major advantage for scaling. Because the server doesn't store individual user states, traffic can be distributed across thousands of different servers, making the entire system more resilient and easier to grow.

Question 2

What are the most common mistakes beginners make when working with JSON?

Accepted Answer

The most frequent issues involve strict syntax requirements that differ from standard JavaScript. In JSON, all keys must be enclosed in double quotes; using single quotes or omitting quotes entirely will cause the data to break. Another common "vibe-killer" is the trailing comma at the end of an object, which often leads to a 400 Bad Request error because the server cannot parse the malformed data. To avoid these errors, developers are encouraged to use formatters and maintain a consistent "schema" or shape for their data.

Question 3

What is the difference between the PUT and PATCH methods in a REST API?

Accepted Answer

The distinction lies in how they handle updates to existing data. PUT is a "full replacement" method, meaning it replaces the entire resource with the new data provided; if you omit a field in a PUT request, the server might accidentally wipe that data out. In contrast, PATCH is used for "partial updates," allowing a developer to surgically change specific fields—like a student's graduation status—while leaving the rest of the record untouched. PATCH is generally considered safer and more bandwidth-efficient for most update scenarios.

Question 4

Why is it considered a security risk to include authentication tokens in a URL?

Accepted Answer

Including sensitive information like API keys or tokens in a URL (e.g., as a query parameter) is a major red flag because URLs are frequently logged in browser histories, server logs, and by various network proxies. This effectively makes the private token public knowledge to anyone with access to those logs. Instead, secure APIs follow the "bouncer at the door" approach by placing sensitive credentials in the "Authorization" header of the HTTP request, which keeps the data encrypted via HTTPS and the URLs clean.

Question 5

How should a developer design "resource-centric" URLs for a professional API?

Accepted Answer

Professional URL design focuses on using plural nouns rather than verbs or implementation details. For example, instead of using a functional name like `/getAllUsers`, a developer should use `/users` to represent the collection. To access a specific item, the ID is appended to the path, such as `/users/123`. This hierarchical structure is intuitive and implementation-agnostic, meaning the URL remains stable even if the underlying database technology changes. Additionally, using versioning (like `/v1/`) in the URL acts as a safety net, allowing developers to make major changes in the future without breaking existing applications.

HTTP, APIs, and JSON for Vibe Coders

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