我将如何将查询参数传递给 Angular 应用程序中服务内的 REST API? [英] How will i pass query parameters to REST API inside a service in an angular application?

问题描述

我正在尝试将服务中的查询参数传递给 REST API.

I'm trying to pass query parameters inside a service to a REST API.

我应该如何传递给 API 的示例.(预期)

Example of how i should pass to API.(EXPECTED)

http://localhost:2000/world/123456789/avengers?type=fruits&fields=_all

已尝试如下:

     all(countId) {
        const headers: HttpHeaders = new HttpHeaders({
            "_id" : countId, 
            "content-type" : "application/json"
        });
        let params = new HttpParams();
        params = params.append("type", "fruits");
        params = params.append("fields", "_all");
        const options = {
            headers: headers,
            params: params
        };
        return this.http.put ( "http://localhost:2000/world/123456789/avengers", options )
    }

但我无法将查询参数传递给它们.我该怎么做?

But i am not able to pass them has query parameters.how will i do that?

推荐答案

您当前正在将您的选项作为请求有效负载发送，就像您发现的那样.如果您没有有效负载，则可以传递 null:

You are currently sending your options as the request payload, like you have discovered. If you do not have a payload, you can pass null:

all(countId) {
  // ....
  return this.http.put("...", null, options)
                              ^^^^
}

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