问题
I am building an application with the help of Angular6 and facing problems in routing. All the routes are working when I click on a particular tab but whenever I refresh the current page, it is throwing 404 error. I have seen many posts regarding this issue on Stack overflow but failed to overcome from this problem.
Below is my app.module.ts
import {BrowserModule} from '@angular/platform-browser';
import {NgModule} from '@angular/core';
import {RouterModule, Routes} from '@angular/router';
import {AppComponent} from './app.component';
import {FetchApiComponent} from './fetch-api/fetch-api.component';
import {FormsModule} from '@angular/forms';
import {HttpClientModule} from '@angular/common/http';
import {UserServiceLatest} from './fetch-latest/app.service';
import {UserServiceTop} from './fetch-top/app.service';
import {YoutubePlayerModule} from 'ngx-youtube-player';
import {SidebarComponent} from './sidebar/sidebar.component';
import {FetchLatestComponent} from './fetch-latest/fetch-latest.component';
import { FetchTopComponent } from './fetch-top/fetch-top.component'
import {UserService} from './fetch-api/app.service';
import { ServiceWorkerModule } from '@angular/service-worker';
import { environment } from '../environments/environment';
import { AngularFireModule } from 'angularfire2';
import * as firebase from 'firebase';
import { firebaseConfig } from './../environments/firebase.config';
import { AngularFireDatabaseModule } from 'angularfire2/database';
import {PushService} from './push.service';
const appRoutes: Routes = [
{
path: '',
component: FetchApiComponent
},
{
path: '/latest',
component: FetchLatestComponent
},
{
path: '/top',
component: FetchTopComponent
},
{
path :'*',
component: FetchApiComponent
}
];
firebase.initializeApp(firebaseConfig);
@NgModule({
declarations: [
AppComponent,
FetchApiComponent,SidebarComponent, FetchLatestComponent, FetchTopComponent
],
imports: [
RouterModule.forRoot(appRoutes),
BrowserModule, YoutubePlayerModule,
FormsModule,
AngularFireModule.initializeApp(firebaseConfig),
AngularFireDatabaseModule,environment.production ?ServiceWorkerModule.register('firebase-messaging-sw.js'):[],ServiceWorkerModule.register('/firebase-messaging-sw.js', { enabled: environment.production }),
HttpClientModule,environment.production ? ServiceWorkerModule.register('ngsw-worker.js') : [], ServiceWorkerModule.register('/ngsw-worker.js', { enabled: environment.production })
],
providers: [UserService,UserServiceTop,UserServiceLatest,PushService],
bootstrap: [AppComponent]
})
export class AppModule {}
Can you point me in right direction?
回答1:
You will see in your example url, that once you get the 404 error you can't make it work, but if you include a hash before the angular-specific url like /#latest it will work.
Why stops working when refreshing? your webserver is intercepting the GET request from your browser and is trying to go directly to the directory /latest, which doesn't exist. It doesn't know that it needs to go to /bosv2, find an angular app, and then add the small ending bit to your path which is a not-real directory but a routing for angular. In your local it would work as when you are doing ng serve, webpack webserver is prepared for this, but not the host where you are hosting the app.
By default, angular is using HTML5 style navigation, but with your current webserver settings you would need the old angularjs style (with hash#).
From here, you have two solutions:
- Change your webserver configuration
Tell Angular to use HashLocationStrategy (perfectly valid solution), you can go old-school with the HashLocationStrategy by providing the
useHash: truein an object as the second argument of the RouterModule.forRoot in the AppModule.@NgModule({ imports: [ ... RouterModule.forRoot(routes, { useHash: true }) // .../#/latest/ ], ...
I would say going the hash style has a couple of downsides, which may not be relevant in your scenario:
- It doesn't produce the clean and SEO Friendly URLs that are easier for users to understand and remember.
- You can't take advantage of the server-side rendering.
Hope you find this answer helpful :)
回答2:
With .htaccess you can try with following way also:
<IfModule mod_rewrite.c>
RewriteEngine on
# Don't rewrite files or directories
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
# Rewrite everything else to index.html
# to allow html5 state links
RewriteRule ^ index.html [L]
</IfModule>
回答3:
To avoid using hashed routes, you must edit your webserver configuration properly, which is the best solution. You just have to configure it so it fallbacks to index.html, which is Angular's bootstrap. Although there is no universal configuration for this, here are some:
Apache
Add a rewrite rule to .htaccess file
RewriteEngine On
# If an existing asset or directory is requested go to it as it is
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} -f [OR]
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} -d
RewriteRule ^ - [L]
# If the requested resource doesn't exist, use index.html
RewriteRule ^ /index.html
Nginx
Use try_files in your location block
try_files $uri $uri/ /index.html;
IIS
Add a rewrite rule to web.config
<system.webServer>
<rewrite>
<rules>
<rule name="Angular Routes" stopProcessing="true">
<match url=".*" />
<conditions logicalGrouping="MatchAll">
<add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
<add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
</conditions>
<action type="Rewrite" url="/index.html" />
</rule>
</rules>
</rewrite>
</system.webServer>
Source: https://angular.io/guide/deployment#server-configuration
回答4:
In app.module.ts
import {LocationStrategy, HashLocationStrategy} from '@angular/common';
After import add following line to providers.
{provide: LocationStrategy, useClass: HashLocationStrategy}
ex:
providers: [AuthService,
AuthGuard,
FlxUiDataTable,
{provide: LocationStrategy, useClass: HashLocationStrategy}]
This will solve your issue. Read Documentation here.
回答5:
I think you are getting 404 because your are requesting http://localhost/route which doesn't exist on tomcat server. As Angular 2 uses html 5 routing by default rather than using hashes at the end of the URL, refreshing the page looks like a request for a different resource.
When using angular routing on tomcat you need to make sure that your server will map all routes in your app to your main index.html while refreshing the page. There are multiple way to resolve this issue. Whichever one suits you you can go for that.
1) Put below code in web.xml of your deployment folder :
<error-page>
<error-code>404</error-code>
<location>/index.html</location>
</error-page>
2) You can also try using HashLocationStrategy with # in the URL for routes :
Try using:
RouterModule.forRoot(routes, { useHash: true })
Instead of:
RouterModule.forRoot(routes)
With HashLocationStrategy your urls gonna be like:
http://localhost/#/route
3) Tomcat URL Rewrite Valve : Re-write the url's using a server level configuration to redirect to index.html if the resource is not found.
3.1) Inside META-INF folder create a file context.xml and copy the below context inside it.
<? xml version='1.0' encoding='utf-8'?>
<Context>
<Valve className="org.apache.catalina.valves.rewrite.RewriteValve" />
</Context>
3.2) Inside WEB-INF, create file rewrite.config(this file contain the rule for URL Rewriting and used by tomcat for URL rewriting). Inside rewrite.config, copy the below content:
RewriteCond %{SERVLET_PATH} !-f
RewriteRule ^/(.*)$ /index.html [L]
回答6:
In my case i did following thing
Method 1 :
in your app.module.ts import below thing
import { HashLocationStrategy, LocationStrategy } from '@angular/common';
@NgModule({
declarations: [...],
imports: [...],
providers: [{provide: LocationStrategy, useClass: HashLocationStrategy}],
bootstrap: [AppComponent]
})
and build with
ng build --base-href /[PROJECT_NAME]/
method 2 :
for nginx,
nano /etc/nginx/sites-available/default
add follwing line in location block
location /[PROJECT_NAME] {
try_files $uri $uri/ /[PROJECT_NAME]/index.html;
}
sudo service nginx restart
and build with
ng build --base-href /[PROJECT_NAME]/
来源：https://stackoverflow.com/questions/50907736/refreshing-the-page-results-in-404-error-angular-6