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API versioning is a critical practice for maintaining backward compatibility while introducing updates. It allows clients to continue using older versions while gradually migrating to newer ones. Below are the common approaches to API versioning:
1. URL Path Versioning
The version is embedded directly in the URL path.
Example:
https://api.example.com/v1/users https://api.example.com/v2/users
2. Query Parameter Versioning
The version is passed as a query parameter.
Example:
https://api.example.com/users?version=1 https://api.example.com/users?version=2
3. Header Versioning
The version is specified in a custom HTTP header.
Example:
[http]
GET /users HTTP/1.1
Host: api.example.com
X-API-Version: 1
[/http]
### **4. Media-Type Versioning (Content Negotiation)**
The version is included in the `Accept` header.
Example:
GET /users HTTP/1.1 Host: api.example.com Accept: application/vnd.company.api.v1+json
### **You Should Know:**
#### **Implementing API Versioning in ASP.NET Core**
Here’s how to set up API versioning in an ASP.NET Core application:
1. **Install the NuGet Package:**
dotnet add package Microsoft.AspNetCore.Mvc.Versioning
2. **Configure Services in `Program.cs`:**
builder.Services.AddApiVersioning(options =>
{
options.DefaultApiVersion = new ApiVersion(1, 0);
options.AssumeDefaultVersionWhenUnspecified = true;
options.ReportApiVersions = true;
});
3. **Apply Versioning to Controllers:**
[ApiVersion("1.0")]
[Route("v{version:apiVersion}/users")]
public class UsersV1Controller : ControllerBase { ... }
[ApiVersion("2.0")]
[Route("v{version:apiVersion}/users")]
public class UsersV2Controller : ControllerBase { ... }
4. **Test Using cURL:**
curl -X GET "https://localhost:5001/v1/users" -H "accept: application/json" curl -X GET "https://localhost:5001/v2/users" -H "accept: application/json"
### **What Undercode Say**
API versioning is essential for smooth transitions in evolving software systems. Below are some related Linux and Windows commands for managing APIs and web services:
#### **Linux Commands:**
- Check API Responses:
curl -I "https://api.example.com/v1/users"
- Monitor HTTP Traffic:
sudo tcpdump -i eth0 port 80 -w api_traffic.pcap
- Test Load Balancing:
ab -n 1000 -c 100 "https://api.example.com/v1/users"
#### **Windows Commands:**
- Test API with PowerShell:
Invoke-RestMethod -Uri "https://api.example.com/v1/users" -Method GET
- Check Network Connections:
netstat -ano | findstr "80"
- Stress Test with `wrk` (if installed):
wrk -t4 -c100 -d30s "https://api.example.com/v1/users"
For further reading, check out:
### **Expected Output:**
A well-versioned API ensures backward compatibility, smooth client transitions, and structured deprecation policies. Use the right versioning strategy based on your project requirements.
References:
Reported By: Nikola Knez – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
