HTTP GET JSON异步请求在Blazor服务器中不起作用

目前，我正在学习Blazor服务器制作一个辅助项目。我只是按照教程制作了一个简单的API控制器，并使用它在Razor页面上显示数据库。控制器像

    [Route("api/[controller]")]
    [ApiController]
    public class EmployeeController: ControllerBase
    {
        private readonly IEmployeeRepository _emp;

        public EmployeeController(IEmployeeRepository emp) {
             _emp = emp;
        }

        [HttpGet]
        public async Task<ActionResult> GetEmployees() {
            return Ok(await _emp.GetEmployees());
        }

        [HttpGet("{id}")]
        public async Task<ActionResult> GetEmployee(int employeeId) {
            return Ok(await _emp.GetEmployee(employeeId));
        }

        [HttpPost]
        public async Task<ActionResult> AddEmployee(Employee employee) {
            return Ok(await _emp.AddEmployee(employee));
        }

        [HttpPut]
        public async Task<ActionResult> UpdateEmployee(Employee employee) {
            return Ok(await _emp.UpdateEmployee(employee));
        }

        [HttpDelete("{id}")]
        public async Task<ActionResult> DeleteEmployee(int employeeId) {
            return Ok(await _emp.DeleteEmployee(employeeId));
        }

    }

在

EmployeeService.cs

中，实现如下

 public class EmployeeService: IEmployeeService 
    {
        private readonly HttpClient _httpClient;
        
        public EmployeeService(HttpClient httpClient) 
        {
            _httpClient = httpClient;
        }

        public async Task<IEnumerable<Employee>> GetEmployees() {
            return await _httpClient.GetJsonAsync<Employee[]>("api/employee");
        }
        public async Task<Employee> GetEmployee(int id)
        {
            return await _httpClient.GetJsonAsync<Employee>($"api/employee/{id}");
        }
    }

但是当我运行应用程序并转到

/empList

时，会出现一些错误，如

An unhandled exception occurred while processing the request.
JsonReaderException: '<' is an invalid start of a value. LineNumber: 1 | BytePositionInLine: 0.
System.Text.Json.ThrowHelper.ThrowJsonReaderException(ref Utf8JsonReader json, ExceptionResource resource, byte nextByte, ReadOnlySpan<byte> bytes)

JsonException: '<' is an invalid start of a value. Path: $ | LineNumber: 1 | BytePositionInLine: 0.
System.Text.Json.ThrowHelper.ReThrowWithPath(ref ReadStack state, JsonReaderException ex)

处理请求时发生未处理的异常。
JsonReaderException:'您需要检查从API调用中看到的响应-您应该能够输入此url并获得返回的结果。另外，如果您在服务器模式下运行，您从何处获取HttpClient？
@page "/empList"
@inject Services.IEmployeeService Service
@using Models


<h3>Employee List</h3>


<div>
    @if (employees == null) {
        <strong>@employees is parsing...</strong>
    }else {
        <table class="table">
            <thead>
                <tr>
                    <th class="col">Id</th>
                    <th class="col">Name</th>
                    <th class="col">Gender</th>
                    <th class="col">DOB</th>
                    <th class="col">Department</th>
                </tr>
            </thead>
            <tbody>
                @foreach (var employee in employees) {
                    <tr>
                        <th>@employee.EmployeeId</th>
                        <th>@employee.EmployeeName</th>
                        <th>@employee.Gender</th>
                        <th>@employee.DateOfBirth</th>
                        <th>@employee.DepartmentId</th>
                    </tr>
                }
            </tbody>
        </table>
    }
</div>



@code {
    private IEnumerable<Employee> employees;
    
    protected override async Task OnInitializedAsync() {
        employees = await Service.GetEmployees();
    }
}

An unhandled exception occurred while processing the request.
JsonReaderException: '<' is an invalid start of a value. LineNumber: 1 | BytePositionInLine: 0.
System.Text.Json.ThrowHelper.ThrowJsonReaderException(ref Utf8JsonReader json, ExceptionResource resource, byte nextByte, ReadOnlySpan<byte> bytes)

JsonException: '<' is an invalid start of a value. Path: $ | LineNumber: 1 | BytePositionInLine: 0.
System.Text.Json.ThrowHelper.ReThrowWithPath(ref ReadStack state, JsonReaderException ex)

JsonReaderException: '<' is an invalid start of a value. LineNumber: 1 | BytePositionInLine: 0.
JsonException: '<' is an invalid start of a value. Path: $ | LineNumber: 1 | BytePositionInLine: 0.

blazorserver_efcore_crud.Services.EmployeeService.GetEmployees() in EmployeeService.cs
+
            return await _httpClient.GetJsonAsync<Employee[]>("api/employee");
blazorserver_efcore_crud.Pages.EmployeeList.OnInitializedAsync() in EmployeeList.razor
+
        employees = await Service.GetEmployees();