我有以下代码:
private static string boundary = "----CustomBoundary" + DateTime.Now.Ticks.ToString("x");
private static async Task<string> PostTest()
{
string servResp = "";
using (var content = new MultipartFormDataContent(boundary))
{
content.Add(new StringContent("105212"), "case-id");
content.Add(new StringContent("1/14/2014"), "dateFrom");
content.Add(new StringContent("1/15/2014"), "dateTo");
HttpClientHandler handler = new HttpClientHandler();
cookieContainer = new CookieContainer();
handler.CookieContainer = cookieContainer;
HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, "http://somewebsite.com/form");
request.Headers.ExpectContinue = false;
request.Content = content;
httpClient = new HttpClient(handler);
HttpResponseMessage response = await httpClient.SendAsync(request);
response.EnsureSuccessStatusCode();
servResp = await response.Content.ReadAsStringAsync();
}
return servResp;
}
当我运行它时,我在Fiddler中看到了Content-Type标题:
Content-Type: multipart/form-data; boundary="----CustomBoundary8d0f01e6b3b5daf"
由于边界值在引号中,服务器会忽略请求正文。如果我删除引号并在Fiddler Composer中运行请求,则正在正确处理请求。
我尝试添加内容标题:
//request.Content.Headers.Add("Content-Type", "multipart/form-data; boundary=" + boundary);
//request.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("multipart/form-data; boundary=" + boundary);
...但它不起作用,错误消息是:“无法添加值,因为标题'Content-Type'不支持多个值。”和“格式值'multipart / form-data,boundary = ---- CustomBoundary8d0f024297b32d5'无效。”,相应地。
如何将正确的Content-Type标头添加到请求中,以便边界值不会用引号括起来?
Content-Type: multipart/form-data; boundary=----CustomBoundary8d0f01e6b3b5daf
答案 0 :(得分:27)
通过从MultipartFormDataContent中删除标头并重新添加它而不进行验证来解决此问题:
content.Headers.Remove("Content-Type");
content.Headers.TryAddWithoutValidation("Content-Type", "multipart/form-data; boundary=" + boundary);
答案 1 :(得分:0)
正如 Darrel Miller 在 RFC 中指出的那样: (我在这里找到) https://datatracker.ietf.org/doc/html/rfc2046#section-5.1.1
引号通常不是必需的。但如果边界值在标头值中包含非法字符,则可能是必要的。 (例如,冒号、逗号、空格等)
非法:
Content-Type: multipart/form-data, boundary=abc:def
法律:
Content-Type: multipart/form-data, boundary="abc:def"
多部分标记,带前导和最后的双连字符,不能有引号:
非法:
--"abc:def"
法律:
--abc:def