CURL 表单发布 (-F) 到 HttpClient 发布答案

【问题标题】：CURL form post (-F) to HttpClient postCURL 表单发布 (-F) 到 HttpClient 发布
【发布时间】：2018-11-30 18:18:32
【问题描述】：

我需要使用 c# 的 HttpClient 将 apk 上传到 hockeyApp，

上传 apk 的 cUrl 如下：

curl \
  -F "status=2" \ 
  -F "notify=1" \ 
  -F "ipa=@hockeyapp.ipa" \ 
  -H "X-HockeyAppToken: 4567abcd8901ef234567abcd8901ef23" \
   https://rink.hockeyapp.net/api/2/apps/upload

我尝试用 c# 做同样的事情：

var stream = await File.ReadAllBytesAsync(apkFilePath);
var bytes = new ByteArrayContent(stream);
bytes.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
var multipartFormDataContent = new MultipartFormDataContent
{
    //send form text values here
    {new StringContent("2"), "status"},
    {new StringContent("0"), "notify"},
    // send file Here
    {bytes, "ipa"}
};

var uri = "https://rink.hockeyapp.net/api/2/apps/upload";

multipartFormDataContent.Headers.Add("X-HockeyAppToken", "++token_here++");

var response = await _client.PostAsync(uri, multipartFormDataContent);

但我得到的响应（经过很长一段时间）是 422 无法处理的实体

【问题讨论】：

标签： c# asp.net .net-core dotnet-httpclient hockeyapp

【解决方案1】：

因为 Hockey App 将被 App Center 取代，所以我也遇到了 422 响应的同样问题。所以我与支持人员交谈并获得了这个非常好的代码示例，也许它会有所帮助。

 // TODO: Update with your info
    private static string apiKey = "<Your API Token>";
    private static string uploadUrl = "https://api.appcenter.ms/v0.1/apps/<Owner Name>/<App Name>/release_uploads";
    private static string releaseUrl = "https://api.appcenter.ms/v0.1/apps/<Owner Name>/<App Name>/release_uploads/";
    private static string fileToUpload = "<Path to your IPA>";
    private static string fileName = "<Your File Name>";

    static async Task Main(string[] args)
    {
        // Get upload url
        var client = new HttpClient();
        var requestMessage = new HttpRequestMessage(HttpMethod.Post, uploadUrl);
        requestMessage.Content = new StringContent("", Encoding.UTF8, "application/json");
        requestMessage.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
        requestMessage.Headers.Add("X-API-Token", apiKey);
        var response = await client.SendAsync(requestMessage);
        var value = await response.Content.ReadAsAsync<UploadResponse>();
        Console.WriteLine($"Upload ID: {value.UploadId}");
        Console.WriteLine($"Upload URL: {value.UploadUrl}");

        // Upload file
        var uploadRequestMessage = new HttpRequestMessage(HttpMethod.Post, value.UploadUrl);
        HttpContent fileStreamContent = new StreamContent(File.OpenRead(fileToUpload));
        using (var formDataContent = new MultipartFormDataContent())
        {
            formDataContent.Add(fileStreamContent, "ipa", fileName);
            uploadRequestMessage.Content = formDataContent;
            var uploadResponse = await client.SendAsync(uploadRequestMessage);
            Console.WriteLine($"Upload Response: {uploadResponse.StatusCode}");
        }

        // Set to committed
        var uri = $"{releaseUrl}{value.UploadId}";
        var updateStatusMessage = new HttpRequestMessage(HttpMethod.Patch, uri);
        updateStatusMessage.Content = new StringContent("{ \"status\": \"committed\" }", Encoding.UTF8, "application/json");
        updateStatusMessage.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
        updateStatusMessage.Headers.Add("X-API-Token", apiKey);
        var updateResponse = await client.SendAsync(updateStatusMessage);
        var releaseResponse = await updateResponse.Content.ReadAsAsync<ReleaseResponse>();
        Console.WriteLine($"Release Response Id: {releaseResponse.ReleaseId}");
        Console.WriteLine($"Release Response URL: {releaseResponse.ReleaseUrl}");

【讨论】：

【解决方案2】：

解决了，

问题出在边界上

cUrl 命令以boundary=xxxxxxxxxxx（无引号）的形式生成边界

但 multipartFormDataContent 在此表单中有边界 boundary="xxxxxxxxxxx"（带引号）

当我删除引号时它工作正常：

// Fix boundary problem (boundary is quoted)
var boundary = multipartFormDataContent.Headers.ContentType.Parameters.First(o => o.Name == "boundary");
boundary.Value = boundary.Value.Replace("\"", string.Empty);

【讨论】：