當心 HttpClient 中 FormUrlEncodeContent 的 bug

時間 2020-06-02

標籤當心 httpclient formurlencodecontent bug 欄目系統網絡简体版

原文原文鏈接

當心 HttpClient 中 FormUrlEncodeContent 的 bug

Intro

最近發現活動室預定項目裏的上傳圖片有時候會有問題，週末找時間測試了一下，發現小圖片的上傳沒問題，大圖片上傳會有問題，並且異常信息還很奇怪，System.UriFormatException: Invalid URI: The Uri string is too long 看這個錯誤的信息還覺得是請求的 url 過長致使的，可是實際請求的 url 很短，詭異的異常信息git

測試示例

爲了方便你們瞭解和測試這個bug，我在 Github 上提供了一個示例 https://github.com/WeihanLi/SamplesInPractice/blob/master/HttpClientTest/FormUrlEncodeContentTest.csgithub

HttpClient 示例代碼：async

public class FormUrlEncodeContentTest
{
    private const string TestUrl = "https://cnblogs.com";

    public static async Task FormUrlEncodedContentLengthTest()
    {
        using (var httpClient = new HttpClient(new NoProxyHttpClientHandler()))
        {
            using (var response = await httpClient.PostAsync(TestUrl, new FormUrlEncodedContent(new Dictionary<string, string>()
            {
                {"bigContent", new string('a', 65535)},
            })))
            {
                Console.WriteLine($"response status code:{response.StatusCode}");
            }
        }
    }

    public static async Task ByteArrayContentLengthTest()
    {
        using (var httpClient = new HttpClient(new NoProxyHttpClientHandler()))
        {
            var postContent = $"bigContent={new string('a', 65535)}";
            using (var response = await httpClient.PostAsync(TestUrl, new ByteArrayContent(postContent.GetBytes())))
            {
                Console.WriteLine($"response status code:{response.StatusCode}");
            }
        }
    }

    public static async Task StringContentLengthTest()
    {
        using (var httpClient = new HttpClient(new NoProxyHttpClientHandler()))
        {
            var postContent = $"bigContent={new string('a', 65535)}";
            using (var response = await httpClient.PostAsync(TestUrl, new StringContent(postContent)))
            {
                Console.WriteLine($"response status code:{response.StatusCode}");
            }
        }
    }
}

測試代碼：post

InvokeHelper.OnInvokeException = Console.WriteLine;

await InvokeHelper.TryInvokeAsync(FormUrlEncodeContentTest.FormUrlEncodedContentLengthTest);
Console.WriteLine();
await InvokeHelper.TryInvokeAsync(FormUrlEncodeContentTest.StringContentLengthTest);
Console.WriteLine();
await InvokeHelper.TryInvokeAsync(FormUrlEncodeContentTest.ByteArrayContentLengthTest);

Console.WriteLine("Completed!");

輸出結果以下：測試