如何在Angular 4中获取HTTP请求标头? [英] How can I get HTTP request headers in Angular 4?
问题描述
在互联网上,我仅看到将参数添加到HTTP请求中,如下所示.
In internet, I see only add parameter to HTTP request like below.
this.headers.append('Content-Type', 'application/json');
this.headers.append('Accept', 'application/json');
this.headers.append('Access-Control-Allow-Credentials', 'true');
我找不到如何在Angular 4中获取HTTP请求标头参数.
I cannot find how can I get HTTP request header params in Angular 4.
推荐答案
Headers类还具有get(name:string)方法,该方法返回字符串,以及用于检查标题的其他有用方法.来自Angular文档:
The Headers class also has a get(name: string) method, which returns a string, as well as other helpful methods for inspecting the headers. From the Angular docs:
https://angular.io/api/common/http/HttpHeaders
class HttpHeaders {
constructor(headers?: string | {...})
has(name: string): boolean
get(name: string): string | null
keys(): string[]
getAll(name: string): string[] | null
append(name: string, value: string | string[]): HttpHeaders
set(name: string, value: string | string[]): HttpHeaders
delete(name: string, value?: string | string[]): HttpHeaders
}
您还可以使用浏览器的开发人员工具检查请求/响应标头.
You could also use your browser's developer tools to inspect the request/response headers.
如果您确切指定需要执行的操作,则可能会有所帮助.是否需要检查特定的标头?
It might be helpful if you specify exactly what it is you need to do. Is there a particular header that you need to inspect?
还有不推荐使用的Headers类.不确定您使用的是哪种,但是在可用方法方面有很多重叠之处,因此甚至可能无关紧要.
There's also the deprecated Headers class. Not sure which you're using, but there's a lot of overlap in terms of the methods available so it may not even matter.
https://angular.io/api/http/Headers
class Headers {
constructor(headers?: Headers | {...})
static fromResponseHeaderString(headersString: string): Headers
append(name: string, value: string): void
delete(name: string): void
forEach(fn: (values: string[], name: string | undefined, headers: Map<string, string[]>) => void): void
get(name: string): string | null
has(name: string): boolean
keys(): string[]
set(name: string, value: string | string[]): void
values(): string[][]
toJSON(): {...}
getAll(name: string): string[] | null
entries()
}
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