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[英]Best way to pass List in query string HttpClient.GetAsync()
[英]HttpClient GetAsync with query string
我正在使用谷歌的地理编码 API。 我有两种方法,一种有效,另一种无效,我似乎无法弄清楚原因:
string address = "1400,Copenhagen,DK";
string GoogleMapsAPIurl = "https://maps.googleapis.com/maps/api/geocode/json?address={0}&key={1}";
string GoogleMapsAPIkey = "MYSECRETAPIKEY";
string requestUri = string.Format(GoogleMapsAPIurl, address.Trim(), GoogleMapsAPIkey);
// Works fine
using (var client = new HttpClient())
{
using (HttpResponseMessage response = await client.GetAsync(requestUri))
{
var responseContent = response.Content.ReadAsStringAsync().Result;
response.EnsureSuccessStatusCode();
}
}
// Doesn't work
using (HttpClient client = new HttpClient())
{
client.BaseAddress = new Uri("https://maps.googleapis.com/maps/api/", UriKind.Absolute);
client.DefaultRequestHeaders.Add("key", GoogleMapsAPIkey);
using (HttpResponseMessage response = await client.GetAsync("geocode/json?address=1400,Copenhagen,DK"))
{
var responseContent = response.Content.ReadAsStringAsync().Result;
response.EnsureSuccessStatusCode();
}
}
我使用GetAsync
发送查询字符串的最后一种方法不起作用,我怀疑为什么会这样。 当我在客户端上引入BaseAddress
时, GetAsync
不会以某种方式发送到正确的 URL。
我不建议将 API 键添加到全局变量中。 也许您需要在 API 之外发送一些 HTTP 请求,密钥就会泄露。
这是有效的示例。
using Newtonsoft.Json;
public class Program
{
private static readonly HttpClient client = new HttpClient();
private const string GoogleMapsAPIkey = "MYSECRETAPIKEY";
static async Task Main(string[] args)
{
client.BaseAddress = new Uri("https://maps.googleapis.com/maps/api/");
try
{
Dictionary<string, string> query = new Dictionary<string, string>();
query.Add("address", "1400,Copenhagen,DK");
dynamic response = await GetAPIResponseAsync<dynamic>("geocode/json", query);
Console.WriteLine(response.ToString());
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
Console.ReadKey();
}
private static async Task<string> ParamsToStringAsync(Dictionary<string, string> urlParams)
{
using (HttpContent content = new FormUrlEncodedContent(urlParams))
return await content.ReadAsStringAsync();
}
private static async Task<T> GetAPIResponseAsync<T>(string path, Dictionary<string, string> urlParams)
{
urlParams.Add("key", GoogleMapsAPIkey);
string query = await ParamsToStringAsync(urlParams);
using (HttpResponseMessage response = await client.GetAsync(path + "?" + query, HttpCompletionOption.ResponseHeadersRead))
{
response.EnsureSuccessStatusCode();
string responseText = await response.Content.ReadAsStringAsync();
return JsonConvert.DeserializeObject<T>(responseText);
}
}
}
Ciao,问题与URL上的key
参数有关。 像这样更改您的代码:
using (HttpClient client = new HttpClient())
{
client.BaseAddress = new Uri("https://maps.googleapis.com/maps/api/");
using (HttpResponseMessage response = await client.GetAsync("geocode/json?address=1400,Copenhagen,DK&key=" + GoogleMapsAPIkey))
{
var responseContent = response.Content.ReadAsStringAsync().Result;
response.EnsureSuccessStatusCode();
}
}
正如谷歌表所说:
在您拥有 API 密钥后,您的应用程序可以 append 查询参数 key=yourAPIKey 到所有请求 URL。 API 密钥可以安全地嵌入 URL; 它不需要任何编码。
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