GET请求适用于邮递员，但不适用于浏览器

本文介绍了GET请求适用于邮递员，但不适用于浏览器的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我遇到了一个我遇到的GET请求的奇怪问题。

I have encountered a strange issue with a GET request that I am stuck on.

function getUser(username){ userGETReq.open("GET", userURL + "/" + username); userGETReq.send(); userGETReq.onload = () => {if(userGETReq.status === 200){//cool stuff }}

我正在跑步在浏览器中的本地主机上-从返回false的表单中调用启动该函数。

I am running on a localhost in the browser - the function to start this is being called from a form that returns false.

<form onsubmit="login(this); return false">

邮递员

成功获得GET请求的邮递员响应图片

我从同一应用程序收到其他有效的GET请求。 此功能与另一个有效功能之间的 only 区别在于，它具有传入的变量并具有设定的路径：

I have other GET requests from the same application that work. The only difference between this and the other one that works is that it has a 'variable' that gets passed in and has a set route:

[Route("api/User/{username}")] public List<User> Get(string username)

这是设置我的CORS的方式

This is how my CORS is set up

EnableCorsAttribute cors = new EnableCorsAttribute("*","*","*"); config.EnableCors(cors);

任何帮助将不胜感激！

我得到的警告：

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at localhost:56390/api/user/test3. (Reason: CORS request did not succeed).

推荐答案

要解决CORS问题，您可以在如下所示的服务

to resolve CORS issue, you can write another method in service as follows

每次进行服务调用时，首先触发OPTIONS来检查是否允许该服务调用，并且一旦OPTIONS返回允许，就会调用实际方法 //您可以在HEADER_AC_ALLOW_ORIGIN下添加呼叫主机的URL或客户端URL

Every time service call is made, OPTIONS is triggered first to check if the service call is allowed and once the OPTIONS returns allowed, actual method is invoked //here you can add URL of calling host or the client URL under HEADER_AC_ALLOW_ORIGIN

@OPTIONS @Path("/yourservice/") @LocalPreflight public Response options() { String origin = headers.getRequestHeader("Origin").get(0); LOG.info(" In options!!!!!!!!: {}", origin); if ("localhost:4200".equals(origin)) { return Response.ok() .header(CorsHeaderConstants.HEADER_AC_ALLOW_METHODS, "GET,POST,DELETE,PUT,OPTIONS") .header(CorsHeaderConstants.HEADER_AC_ALLOW_CREDENTIALS, "false") .header(CorsHeaderConstants.HEADER_AC_ALLOW_ORIGIN, "localhost:4200") .header(CorsHeaderConstants.HEADER_AC_ALLOW_HEADERS, "content-type") .build(); } else { return Response.ok().build(); } }