Xamarin UWP HTTPS REST 调用返回乱码

Question

看来我在这里碰壁了，需要一双新的眼睛从不同的角度看待问题。

上下文

我有一个适用于 iOS、Android 和 UWP 的 Xamarin.Forms PCL 应用程序。 我需要调用 REST 服务；有些是纯 HTTP，有些是 HTTPS。

问题

对于 iOS 和 Android，一切正常。 对于 UWP，HTTP 调用工作正常，HTTPS 调用而不是预期的 JSON，返回乱码。这是一个示例：

"\u001f�\b\0\0\0\0\0\0��V\nK-�����W�244��Q\n-N-�K�MU�R O�+����I�ϪJ,(P�Q\n��\u0001I8��f�)�\u0002\02d+�>\0\0\0"

调用代码在 PCL 中使用 System.Net.Http 框架库（见下文）。

有没有人遇到过类似的问题？

        /// <summary>
    /// A generic api call to a REST Web service, with data to be sent.
    /// </summary>
    /// <typeparam name="TParam">The type of object for the data that will be sent, used by post</typeparam>
    /// <typeparam name="TResult">The type of object for the response of the server,expected to be of IClientApiModel type</typeparam>
    ///<param name="Uri">The service URI</param>
    /// <param name="isPost">Whether the API should be treated as POST (<code>true</code>) or as a GET (<code>false</code>).</param>
    /// <param name="param">The input data (can be null).</param>
    /// <param name="authorization">The authorization header for the REST service</param>
    /// <returns>An object of type TResult, and in case of Exception with the HasErrors property set to <code>true</code>.</returns>
    protected async Task<TResult> RequestAsync<TParam, TResult>(string Uri, bool isPost, TParam param, AuthenticationHeaderValue authorization)
        where TResult : IClientApiModel, new()
    {
        try
        {
            using (HttpClient client = new HttpClient())
            {
                using (HttpRequestMessage request = new HttpRequestMessage(isPost ? HttpMethod.Post : HttpMethod.Get, Uri))
                {
                    request.Headers.Authorization = authorization;

                    if (param != null)
                    {
                        var data = new StringContent(JsonConvert.SerializeObject(param));
                        request.Content = data;
                        request.Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
                    }

                    using (HttpResponseMessage response = await client.SendAsync(request)) //(request))
                    {
                        if (response.StatusCode != HttpStatusCode.OK)
                        {
                            if (response.StatusCode == HttpStatusCode.NotFound)
                            {
                                return new TResult() { HasErrors = true, HasNoConnection = true };
                            }
                            return new TResult() { HasErrors = true };
                        }
                        var content = await response.Content.ReadAsStringAsync();

                        TResult model = content.IsJson() ?
                            JsonConvert.DeserializeObject<TResult>(content) :
                            new TResult() { HasErrors = true };

                        return model;
                    }
                }
            }
        }
        catch (WebException weberror)
        {
            throw weberror;
        }
        catch (Exception e)
        {
            var def = new TResult() { HasErrors = true };
            return def;
        }
    }

Answer 1

只是为了让大家知道......最后一切都归结为为 HttpClient 配置一个处理程序：

HttpClientHandler handler = new HttpClientHandler()
{
    AllowAutoRedirect = false
};
_httpClient = new HttpClient(handler);