我曾多次遇到CORS问题，通常可以解决它，但我想通过从MEAN堆栈范式中看到这一点来真正理解。
之前我只是在我的快速服务器中添加了中间件来捕获这些东西，但它看起来像有某种预挂钩，使我的请求出错。
在preflight响应中，Access-Control-Allow-Headers不允许请求报头字段Access-Control-Allow-Headers
我假设我可以这样做:
app.use(function(req, res, next) {
res.header("Access-Control-Allow-Headers","*")
})
或者等价的，但这似乎不能解决问题。我当然也试过
app.use(function(req, res, next) {
res.header("Access-Control-Allow-Headers","Access-Control-Allow-Headers")
})
还是不走运。
当前回答
在Post API调用中，我们在请求体中发送数据。因此，如果我们将通过向API调用添加任何额外的头来发送数据。然后第一个OPTIONS API调用会发生，然后post调用会发生。因此，您必须首先处理OPTION API调用。
你可以通过编写一个过滤器来处理这个问题，在里面你必须检查选项调用API调用并返回一个200 OK状态。下面是示例代码:
package com.web.filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.catalina.connector.Response;
public class CustomFilter implements Filter {
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
throws IOException, ServletException {
HttpServletResponse response = (HttpServletResponse) res;
HttpServletRequest httpRequest = (HttpServletRequest) req;
response.setHeader("Access-Control-Allow-Origin", "*");
response.setHeader("Access-Control-Allow-Methods", "POST, GET, PUT, OPTIONS, DELETE");
response.setHeader("Access-Control-Max-Age", "3600");
response.setHeader("Access-Control-Allow-Headers", "x-requested-with, Content-Type");
if (httpRequest.getMethod().equalsIgnoreCase("OPTIONS")) {
response.setStatus(Response.SC_OK);
}
chain.doFilter(req, res);
}
public void init(FilterConfig filterConfig) {
// TODO
}
public void destroy() {
// Todo
}
}
其他回答
消息是明确的，“授权”是不允许在API。集 Access-Control-Allow-Headers: "Content-Type, Authorization"
在接下来的js我的问题得到解决使用
const cors=micro_cors({
origin:"https://studio.apollographql.com",
allowMethods:['POST','GET','PUT','PATCH','DELETE','OPTIONS'],
allowCredentials:true,
allowHeaders:['X-Requested-With','X-HTTP-Method-Override','Content-Type','Authorization','Accept','Access-Control-Allow-Credentials','Access-Control-Allow-Origin' ]
})
然后把它吸进去
export default cors(async function handler(req, res) {
await serverStart
if(req.method==="OPTIONS"){
res.end()
return false
}
apolloserver.createHandler({path:"/api/graphql"})(req,res)
})
我收到了错误的OP声明使用Django, React和Django -cor -headers库。要用这个堆栈修复它，请执行以下操作:
在settings.py中根据官方文档添加以下内容。
from corsheaders.defaults import default_headers
CORS_ALLOW_HEADERS = default_headers + (
'YOUR_HEADER_NAME',
)
我也面临着同样的问题。
我做了一个简单的改变。
<modulename>.config(function($httpProvider){
delete $httpProvider.defaults.headers.common['X-Requested-With'];
});
如果您试图在请求标头上添加自定义标头，则必须让服务器知道允许发生特定的标头。在过滤请求的类中执行此操作。在下面的例子中，自定义头名称为"type":
public class CorsFilter implements Filter {
@Override
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
response.setHeader("Access-Control-Allow-Origin", request.getHeader("Origin"));
response.setHeader("Access-Control-Allow-Credentials", "true");
response.setHeader("Access-Control-Allow-Methods", "GET,PUT,POST,DELETE,PATCH,OPTIONS");
response.setHeader("Access-Control-Max-Age", "3600");
response.setHeader("Access-Control-Allow-Headers", "Content-Type, Accept, X-Requested-With, remember-me, Authorization, type ");
response.setHeader("Access-Control-Expose-Headers","Authorization");
}
}
