APIs have become so ingrained in our lives that we now say we "access" an API instead of connecting to a web service. One of the cornerstones of such a heavily used technology is versioning. So, when versioning our APIs, should we use URIs or HTTP Headers? This has been a hotly debated topic in developer communities for a long time. Based on my own experiences, let's lay out the pros, cons, and when to choose which approach. In this post, I will delve deep into API versioning strategies, explaining the advantages and disadvantages of both approaches with concrete examples. My goal is to help developers choose the most suitable versioning strategy for their own projects. Why Should We Do API Versioning? When we start developing an API, adding new features or changing existing ones becomes inevitable over time. However, these changes can break existing users and integrations. This is precisely where API versioning comes into play. Versioning allows the API to evolve while maintaining backward compatibility.…