带有字符串值C＃的HttpClient发布

Question

I am trying to post a request with following code, I have this code which fails (server complains bad request, as I have no control over server so dont know what server does.)

private static readonly HttpClient client = new HttpClient();     
var values = new Dictionary<string, string>{
                    { "x", "value" }};
var content  = new FormUrlEncodedContent(values);
var response = await client.PostAsync(postUrl, content);

and then I have this code which works

private static readonly HttpClient client = new HttpClient();     
var values = new Dictionary<string, string>{
                    { "x", "\"value\"" }};
var content = new FormUrlEncodedContent(values);
var response = await client.PostAsync(postUrl, content);

Only difference is my value has extra "" around it. Can anyone please why it is happening? Or if I should have used something else?

Answer 1

In the one that works, you are escaping the quotes. That's what's enabling it work. It means that most likely the value is separated by a space. That is, it contains two words. Usually you have to do a url encode for the value or you just keep it in quotes. So when you escape the quotes with the /“ you are sending it to the server with the quotes hence it's working.

Answer 2

Let's consider this sample program.

static void Main(string[] args)
{
    Show(new Dictionary<string, string> { { "x", "value" } });
    Show(new Dictionary<string, string> { { "x", "\"value\"" } });
}

private static async void Show(Dictionary<string, string> values)
{
    var content = new FormUrlEncodedContent(values);
    var body = await content.ReadAsStringAsync();
    Console.WriteLine(body);
}

The output is: x=value x=%22value%22

In the first case when the server reads the body it sees x=value , and value is not a string.