一直收到下面这个错误。
localhost:3000negotiate?negotiateVersion=1 404 (Not Found)Error: 未能完成与服务器的协商。错误。Not FoundError.Failed to start the connection: 错误:未找到 Failed to start the connection: 错误:未找到 未找到
这是软件版本
<PropertyGroup>
<TargetFramework>netcoreapp3.1</TargetFramework>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="Microsoft.AspNetCore.SignalR.Common" Version="5.0.0-``
<PackageReference Include="Microsoft.AspNetCore.SignalR.Core" Version="1.1.0" />
</ItemGroup>
"dependencies": {
"@microsoft/signalr": "^3.1.4",
这是我的Cors.cs。我试过不包含.WithOrigins或改变端口,但没有用。
public static void ConfigureServices(IServiceCollection services)
{
services.AddCors(options =>
{
options.AddPolicy("AllowAllCors", builder =>
{
builder
.WithOrigins("https://localhost:3000")
.AllowAnyHeader()
.AllowAnyMethod()
.AllowCredentials()
.SetIsOriginAllowedToAllowWildcardSubdomains()
.SetIsOriginAllowed(delegate (string requestingOrigin)
{
return true;
}).Build();
});
});
public static void Configure(IApplicationBuilder app)
{
app.UseCors("AllowAllCors");
app.UseSignalR(routes =>
{
routes.MapHub<ChatHub>("/client/messages");
});
}
--
import React, { Component } from 'react';
import * as signalR from '@microsoft/signalr';
class EmailEditor extends Component {
constructor(props) {
super(props);
this.state = {
nick: '',
message: '',
messages: [],
hubConnection: null,
};
}
componentDidMount = () => {
const nick = window.prompt('Your name:', 'John');
const hubConnection = new signalR.HubConnectionBuilder()
.withUrl("/client/messages")
.configureLogging(signalR.LogLevel.Information)
.build();
this.setState({ hubConnection, nick }, () => {
this.state.hubConnection.start()
.then(() => console.log('Connection started!'))
.catch(err => console.log('Error while establishing connection :('+ err));
this.state.hubConnection.on('ReceiveMessage', (nick, receivedMessage) => {
const text = `${nick}: ${receivedMessage}`;
const messages = this.state.messages.concat([text]);
this.setState({ messages });
});
});
};
服务器的端口在5001上,因此它必须是...。
const hubConnection = new signalR.HubConnectionBuilder()
.withUrl("https://localhost:5001/client/messages")
.configureLogging(signalR.LogLevel.Information)
.build();