Axios响应获得200个代码状态,但有时数据为空

问题描述

我正在使用Asp.net Core 2.2 Web API和ReactJS Axios,但有时(大约100倍中的1倍)响应状态为200,但数据为空字符串。

服务器端控制器代码为:

[Route("api/[controller]")]
[ApiController]
public class SomeApiController : ControllerBase
{
                
    [HttpPost("GetData")]
    public IActionResult GetData([FromBody] int id_search)
    {
        // *Here I get a list data from back using the id_search*

        string json = JsonConvert.SerializeObject(List_data,Formatting.Indented));

        // *Here I write the json string in a text file,for debbug the data to send*

        return Ok(json);
    }
                
}

到目前为止,一切都很好,我在文本文件中编写的json字符串具有如下数据:

[
  {
    "cod_db": 1,"nom_db": "Nom1"
  },{
    "cod_db": 2,"nom_db": "Nom2"
  }
]

Axios客户端JavaScript代码为(我正在使用axios 0.19.2)

import axios from 'axios';

const clienteAxios = axios.create({
    baseURL: 'https://localhost:44364/api/'
}):

export default clienteAxios;

客户端axios方法是:

const getData = () => {
    const config = {
        headers: {
            'Content-Type': 'application/json',// * The next headers I wrote because i think the problem could be CORS too,but I dont know if are necessary *
            'Access-Control-Allow-Origin': '*','Access-Control-Allow-Credentials': true,'Cache-Control': 'no-cache','Access-Control-Allow-Headers': 'Content-type,Accept'
        }
    }

    var id_search = 1;
    clienteAxios.post('SomeApi/GetData',id_search,config)
        .then(d=>{
            console.log(d);
        })
        .catch(d=>{
            console.log("error");
            console.log(d);
        })
}    

大多数情况下,响应中都有数据,但是有时(很难发生),即使服务器端有效发送了数据(我知道,因为文本文件记录了要发送的数据),并且.then方法的代码状态为200。

我不知道为什么会这样,但是我怀疑可能是因为CORS。我在Startup.cs存档中有以下cors配置:

public void ConfigureServices(IServiceCollection services)
{
    services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
            
    //CORS Activación 
    services.AddCors(
        options => options.AddPolicy("EnableCORS",builder =>
            {
                builder
                .AllowAnyOrigin()
                .AllowAnyMethod()
                .AllowAnyHeader()
                .AllowCredentials()
                .Build();
            })
    );
}

public void Configure(IApplicationBuilder app,IHostingEnvironment env)
{
    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
    }
    else
    {
        // The default HSTS value is 30 days. You may want to change this for production scenarios,see https://aka.ms/aspnetcore-hsts.
        app.UseHsts();
    }

    //Enable CORS policy "AllowCors"
    app.UseCors("EnableCORS");

    app.UseHttpsRedirection();
    app.UseMvc();
}

我在做错什么吗,还是有人知道为什么会这样?

编辑:经过多次尝试,我终于设法重新创建了该错误(请记住该错误很难发生)。 Chrome浏览器开发人员工具 “控制台”选项卡什么都不显示,而“网络”选项卡显示:

Headers:
    General:
        Request URL: https://localhost:44364/api/Login/GetDataBases
        Request Method: POST
        Status Code: 200 
        Remote Address: [::1]:44364
        Referrer Policy: no-referrer-when-downgrade
    Response Headers:
        access-control-allow-credentials: true
        access-control-allow-origin: *
        content-length: 0
        content-type: text/plain; charset=utf-8
        date: Fri,04 Sep 2020 10:16:46 GMT
        server: Microsoft-IIS/10.0
        status: 200
        vary: Origin
        x-powered-by: ASP.NET
    Request Headers:
        :authority: localhost:44364
        :method: POST
        :path: /api/Login/GetDataBases
        :scheme: https
        accept: application/json,text/plain,*/ *
        accept-encoding: gzip,deflate,br
        accept-language: es-ES,es;q=0.9
        access-control-allow-credentials: true
        access-control-allow-headers: Content-type,Accept
        access-control-allow-origin: *
        cache-control: no-cache
        content-length: 1
        content-type: application/json
        origin: http://localhost:3000
        referer: http://localhost:3000/
        sec-fetch-dest: empty
        sec-fetch-mode: cors
        sec-fetch-site: cross-site
        user-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML,like Gecko) Chrome/85.0.4183.83 Safari/537.36
    Request Payload:
        1
            No properties
Response:
    This request has no response data available.

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