如何使用参数创建HTTP get请求

Question

是否可以通过HTTPget请求传递参数？如果是这样,我该怎么做呢？我找到了一个HTTP帖子请求(链接).在该示例中,字符串postData被发送到网络服务器.我想用get做同样的事情.谷歌发现,在这个例子中HTTP得到这里.但是,没有参数发送到Web服务器.

Answer 1

我的首选方式是这样.它为您处理转义和解析.

WebClient webClient = new WebClient();
webClient.QueryString.Add("param1", "value1");
webClient.QueryString.Add("param2", "value2");
string result = webClient.DownloadString("http://theurl.com");

Answer 2

首先WebClient是更容易使用; 在查询字符串上指定了GET参数 - 唯一的技巧是记住转义任何值:

        string address = string.Format(
            "http://foobar/somepage?arg1={0}&arg2={1}",
            Uri.EscapeDataString("escape me"),
            Uri.EscapeDataString("& me !!"));
        string text;
        using (WebClient client = new WebClient())
        {
            text = client.DownloadString(address);
        }

Answer 3

在GET请求中,您将参数作为查询字符串的一部分传递.

string url = "http://somesite.com?var=12345";

Answer 4

WebRequest对象对我来说似乎太多了.我更喜欢使用WebClient控件.

要使用此功能,您只需创建两个包含参数和请求标头的NameValueCollections.

考虑以下功能:

    private static string DoGET(string URL,NameValueCollection QueryStringParameters = null, NameValueCollection RequestHeaders = null)
    {
        string ResponseText = null;
        using (WebClient client = new WebClient())
        {
            try
            {
                if (RequestHeaders != null)
                {
                    if (RequestHeaders.Count > 0)
                    {
                        foreach (string header in RequestHeaders.AllKeys)
                            client.Headers.Add(header, RequestHeaders[header]);
                    }
                }
                if (QueryStringParameters != null)
                {
                    if (QueryStringParameters.Count > 0)
                    {
                        foreach (string parm in QueryStringParameters.AllKeys)
                            client.QueryString.Add(parm, QueryStringParameters[parm]);
                    }
                }
                byte[] ResponseBytes = client.DownloadData(URL);
                ResponseText = Encoding.UTF8.GetString(ResponseBytes);
            }
            catch (WebException exception)
            {
                if (exception.Response != null)
                {
                    var responseStream = exception.Response.GetResponseStream();

                    if (responseStream != null)
                    {
                        using (var reader = new StreamReader(responseStream))
                        {
                            Response.Write(reader.ReadToEnd());
                        }
                    }
                }
            }
        }
        return ResponseText;
    }

将查询字符串参数(如果需要)添加为NameValueCollection,如下所示.

        NameValueCollection QueryStringParameters = new NameValueCollection();
        QueryStringParameters.Add("id", "123");
        QueryStringParameters.Add("category", "A");

将您的http标头(如果需要)添加为NameValueCollection,如下所示.

        NameValueCollection RequestHttpHeaders = new NameValueCollection();
        RequestHttpHeaders.Add("Authorization", "Basic bGF3c2912XBANzg5ITppc2ltCzEF");

Answer 5

具有多个参数的 GET 请求：

curl --request GET --url http://localhost:8080/todos/ ?limit=10&offset=2 --header 'content-type:application/json'