Getting “A From phone number is required” in JSON call to Twilio

问题

I'm trying to use JSON over HTTP to communicate with the Twilio API (I'm running on asp.net vNext - and their C# library doesn't yet support coreclr)

I've got the following code, but every time I call the API I get the same 400 - Bad request response:

{"code": 21603, "message": "A 'From' phone number is required.", "more_info": "https://www.twilio.com/docs/errors/21603", "status": 400}

I'm using the following code to setup the request and make the call - the auth succeeds and I get the above error:

var byteArray = Encoding.ASCII.GetBytes("{AccountSid}:{AuthToken}");

HttpClient client = new HttpClient();
client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(byteArray));

var jsonStr = JsonConvert.SerializeObject(new {
    From = WebUtility.UrlEncode("+15005550003"), // A test number twilio supply
    To = WebUtility.UrlEncode("{my phone number}"),
    Body = WebUtility.UrlEncode("Hi there from a pure json rest client...")
});

var response = await client.PostAsync("https://api.twilio.com/2010-04-01/Accounts/{AccountSid}/SMS/Messages.json", new StringContent(jsonStr));

回答1:

After contacting support and dealing with a very helpful guy called Joshua, we have figured it out.

In Twilio docs you can either use a url with "messages.json" or "messages.xml" - I took that to mean: whichever url you use, the message (request and response) will have to follow that format.

Unfortunately that is not true - all requests to Twilio, must be of Content-Type: application/x-www-form-urlencoded

e.g. To=0123456789&From=9876543210&Body=Hi

in C# (HttpClient) that looks like:

_client.PostAsync(_url, new FormUrlEncodedContent(new Dictionary<string, string>(){
 { "To", "0123456789" }, 
 { "From", "9876543210" }, 
 { "Body", "Hi" } }));

回答2:

I'm Megan from the Developer Community team at Twilio.

It looks like the number you are using, "+15005550003" is one of Twilio's magic input numbers that actually represents the "To" field, thus the error you are receiving. Depending on what you want to test, you might try passing in "+15005550006" instead.

You can see more about what each magic input represents in the docs here.

Hope this helps!

回答3:

If using an SMS / Messaging Service which allows you to send from multiple phone numbers and you get this error,

then replace

{ "From","<number>" }

with

{ "MessagingServiceSid","<sid>" }

the SID can be found on the messaging services page https://www.twilio.com/console/sms/services

来源：https://stackoverflow.com/questions/33764125/getting-a-from-phone-number-is-required-in-json-call-to-twilio

标签

json

rest

twilio