C# POST 请求传富文本时请求接口报错400

Z时代
2024-01-10
分类：技术分享

这是Postman的请求截图

图片说明

经过测试，如果newcontent内容为正常字符串时没有问题，现在要求传一个富文本内容。例如：

图片说明

场景：C#后台请求Java接口

这是C#请求代码

public string PostToPushNews(string url, NewsInfo info, NewsDetail detail)
{
//此处换为自己的请求url
Dictionary<string, string> dic = new Dictionary<string, string>
{
{ "head", "{"newid":""+info.newid+"","status":""+info.status+"","md5":""+info.md5+""}" },
{ "params", "{"newcontent":""+HttpUtility.UrlEncode(detail.newcontent,Encoding.UTF8)+"","ywfromdate":""+detail.ywfromdate+"","ywfrompingtai":""+detail.ywfrompingtai+"","ywid":""+info.newid+"","ywtitle":""+detail.ywtitle+"","ywurl":""}" }
};//新闻原文链接放在正文，ywurl参数不进行设置
string result = string.Empty;
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
#region 添加Post 参数
StringBuilder builder = new StringBuilder();
int i = 0;
foreach (var item in dic)
{
if (i > 0)
builder.Append("&");
builder.AppendFormat("{0}={1}", item.Key, item.Value);
i++;
}
byte[] data = Encoding.UTF8.GetBytes(builder.ToString());
req.ContentLength = data.Length;
using (Stream reqStream = req.GetRequestStream())
{
reqStream.Write(data, 0, data.Length);
reqStream.Close();
}
#endregion
HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
Stream stream = resp.GetResponseStream();
//获取响应内容
using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
{
result = reader.ReadToEnd();
}
return result;
}