3.2 KiB
Using absolute URLs for HTTP (data) requests on the server
在服务器端使用HTTP（数据）请求的绝对URL
The tutorial's HeroService and HeroSearchService delegate to the Angular HttpClient module to fetch application data.
These services send requests to relative URLs such as api/heroes.
In a server-side rendered app, HTTP URLs must be absolute (for example, https://my-server.com/api/heroes).
This means that the URLs must be somehow converted to absolute when running on the server and be left relative when running in the browser.
本教程的HeroService和HeroSearchService委托给Angular HttpClient模块来获取应用数据。这些服务会向api/heroes类的相对 URL发送请求。在服务器端呈现的应用中，HTTP URL必须是绝对的 （例如， https://my-server.com/api/heroes ）。这意味着当在服务器上运行时，URL必须以某种方式转换为绝对值，并且当在浏览器中运行时，它们是相对的。
If you are using one of the @nguniversal/*-engine packages (such as @nguniversal/express-engine), this is taken care for you automatically.
You don't need to do anything to make relative URLs work on the server.
如果你正在使用其中一个@nguniversal/*-engine软件包（例如@nguniversal/express-engine ），这会自动为你服务。你无需做任何事情来让相对URL在服务器上运行。
If, for some reason, you are not using an @nguniversal/*-engine package, you may need to handle it yourself.
如果，出于某种原因，你没有使用@nguniversal/*-engine包，你可能需要亲自处理它。
The recommended solution is to pass the full request URL to the options argument of renderModule() or renderModuleFactory() (depending on what you use to render AppServerModule on the server).
This option is the least intrusive as it does not require any changes to the app.
Here, "request URL" refers to the URL of the request as a response to which the app is being rendered on the server.
For example, if the client requested https://my-server.com/dashboard and you are rendering the app on the server to respond to that request, options.url should be set to https://my-server.com/dashboard.
建议的解决方案是将完整的请求URL传递给renderModule（）或renderModuleFactory（）的options参数（具体取决于你在服务器上渲染AppServerModule用途）。此选项的侵入性最小，因为它不需要对应用进行任何更改。这里，“request URL”指的是请求的URL，作为应用在服务器上呈现的响应。例如，如果客户端请求了https://my-server.com/dashboard并且要在服务器上渲染该应用来响应该请求，那么options.url应设置为https://my-server.com/dashboard 。
Now, on every HTTP request made as part of rendering the app on the server, Angular can correctly resolve the request URL to an absolute URL, using the provided options.url.
现在，作为在服务器上呈现应用的一部分，每次HTTP请求，Angular都可以使用提供的options.url正确地将请求URL解析为绝对URL。