Postman的Get请求在ASP.NET控制器中失效，请求排查解决

Hey there! Let's work through your issues step by step—switching from Spring/Java to ASP.NET can feel a bit jarring at first, but we'll get this sorted out.

1. Fixing Postman GET Request Failures #

First, let's figure out why Chrome works but Postman doesn't. The most common culprits here are:

• SSL Certificate Trust Issues: Chrome automatically trusts the local development certificate generated by Visual Studio, but Postman doesn't by default. Here's how to fix it quickly:

  • Open Postman, click the gear icon in the top right to open Settings > Go to the General tab
  • Toggle off SSL certificate verification (this is totally safe for local development testing)

• URL Typos: Double-check that the URL in Postman matches exactly what you used in Chrome: https://localhost:44338/api/user/mock (even though ASP.NET routing is case-insensitive, it's easy to mistype a character without noticing).

• Proxy Conflicts: If you're behind a corporate proxy, Postman might route requests through it while Chrome uses your system's proxy settings. Try disabling proxy in Postman's settings if this applies to you.

2. Implementing a POST Request Endpoint #

Adding a POST endpoint is straightforward once you get familiar with ASP.NET Core's attribute-based routing. Here's how to update your controller:

First, make sure your User class has public getters/setters (so it can be properly serialized/deserialized):

public class User
{
    public string Id { get; set; }
    public string Password { get; set; }
    public string Email { get; set; }
}

Then add the POST method to your UserController:

[Route("api/[controller]")]
[ApiController]
public class UserController : ControllerBase
{
    // Your existing GET mock endpoint
    [HttpGet("mock")]
    public ActionResult<User> GetUser()
    {
        User user = new User();
        user.Id = "adasds";
        user.Password = "adadasd";
        user.Email = "adasd@sads.com";
        return user;
    }

    // New POST endpoint for creating users
    [HttpPost("create")]
    public ActionResult<User> CreateUser([FromBody] User newUser)
    {
        // Add basic validation (adjust based on your needs)
        if (string.IsNullOrWhiteSpace(newUser.Email) || string.IsNullOrWhiteSpace(newUser.Password))
        {
            return BadRequest("Email and Password cannot be empty.");
        }

        // Mock user creation (in a real app, you'd save to a database here)
        newUser.Id = Guid.NewGuid().ToString(); // Generate a unique ID
        return Ok(newUser); // Return the created user with a 200 OK status
    }
}

To test this in Postman:

• Set the request method to POST
• Use the URL https://localhost:44338/api/user/create
• Go to the Body tab, select raw and set the format to JSON
• Paste a sample payload like:

  {
      "email": "test@example.com",
      "password": "test123"
  }
  

• Send the request—you should get back the user with a generated unique ID.

3. Changing the Local Development Port #

If you want to modify the port your app runs on, here's how:

• In your Visual Studio project, navigate to the Properties folder and open launchSettings.json
• Look for the iisSettings section—update the sslPort value to your desired HTTPS port (e.g., 44300)
• Also update the applicationUrl in the profiles section (both the HTTP and HTTPS URLs) to match the new port
• Save the file, restart your application, and the new port will be active.

内容的提问来源于stack exchange，提问作者Thadeu Melo