Twilio iOS SDK fails with "400 Bad request" on outgoing call

Question

Took the source code of example provided here, converted to Swift 3 and applied my generated token of an upgraded Twilio account.

When trying to make a call, it plays a sound, but then fails with a HTTP/1.0 400 Bad request when trying to access https://matrix.twilio.com/2012-02-09/AC ....

Here's the log after trying to make a call -

2016-10-16 18:32:12.955056 MyApp[577:121739] [DEBUG TCDeviceInternal] Inside TCDeviceInternal initWithCapabilityToken, capabilityToken_: (null)
2016-10-16 18:32:12.961112 MyApp[577:121739] [VERBOSE TCDeviceInternal] Inside decodeCapabilityToken:, Header: {
    alg = HS256;
    typ = JWT;
}
2016-10-16 18:32:12.962305 MyApp[577:121739] [VERBOSE TCDeviceInternal] Inside decodeCapabilityToken:, payload: {
    exp = 1476635532;
    iss = ....REMOVED....................;
    scope = "scope:client:incoming?clientName=TestName scope:client:outgoing?appSid=AP.....REMOVED......&clientName=TestName";
}
2016-10-16 18:32:12.962611 MyApp[577:121739] [VERBOSE TCDeviceInternal] Scope URI: scope:client:incoming?clientName=TestName, inside setCapabilitiesWithCapabilityToken:
2016-10-16 18:32:12.962860 MyApp[577:121739] [VERBOSE TCDeviceInternal] Scope URI: scope:client:outgoing?appSid=AP.............REMOVED.......&clientName=TestName, inside setCapabilitiesWithCapabilityToken:
2016-10-16 18:32:12.963710 MyApp[577:121739] [DEBUG TCConstants] X-Twilio-Client string: {"p":"ios","v":"1.2.7.b99-1015b1f","mobile":{"arch":"unknown type 16777228 subtype 1","product":"iPhone","name":"iPhone8,4","v":"10.0.2"}}, inside TCConstants clientString
2016-10-16 18:32:13.035381 MyApp[577:121739] [VERBOSE Twilio] Inside initWithConfig:, codec: speex/16000/1 -> priority: 255
2016-10-16 18:32:13.035425 MyApp[577:121739] [VERBOSE Twilio] Inside initWithConfig:, codec: speex/8000/1 -> priority: 254
2016-10-16 18:32:13.035457 MyApp[577:121739] [VERBOSE Twilio] Inside initWithConfig:, codec: speex/32000/1 -> priority: 0
2016-10-16 18:32:13.035500 MyApp[577:121739] [VERBOSE Twilio] Inside initWithConfig:, codec: opus/48000/1 -> priority: 0
2016-10-16 18:32:13.035574 MyApp[577:121739] [VERBOSE Twilio] Inside initWithConfig:, codec: PCMU/8000/1 -> priority: 128
2016-10-16 18:32:13.035669 MyApp[577:121739] [VERBOSE Twilio] Inside initWithConfig:, codec: PCMA/8000/1 -> priority: 0
2016-10-16 18:32:13.035843 MyApp[577:121739] [DEBUG Twilio] Inside startStateNotificationsForObject, delegate: <TCDeviceInternal: 0x17018c710>
2016-10-16 18:32:13.036069 MyApp[577:121739] [VERBOSE Twilio] Inside addUserAccount:, Registration URL: sip:[email protected];transport=tls
2016-10-16 18:32:13.037112 MyApp[577:121739] [DEBUG TwilioReachability] Reachability Flag Status: -R ------- networkStatusForFlags
2016-10-16 18:32:13.037191 MyApp[577:121739] [DEBUG TCDeviceInternal] Internet reachability: 1
2016-10-16 18:32:13.037434 MyApp[577:121739] [DEBUG TCDeviceInternal] Created TCDeviceInternal: <TCDeviceInternal: 0x17018c710> for accountId: 0
2016-10-16 18:32:13.038306 MyApp[577:121739] [DEBUG TCHttpJsonLongPollConnection] Inside TCHTTPJSONLongPollConnection run(), gonna connect to host matrix.twilio.com, port 443
2016-10-16 18:32:13.039266 MyApp[577:121739] [DEBUG TCHttpJsonLongPollConnection] Inside onSocketWillConnect, sock: <TCAsyncSocket 0x17418ddd0 local nowhere remote nowhere has queued 0 reads 0 writes, no current read, no current write, read stream 0x17010d260 not open, write stream 0x1701065d0 not open, not connected>, self: <TCHttpJsonLongPollConnection 0x1740aa9e0 url=https://matrix.twilio.com/2012-02-09/.........REMOVED............../TestName?AccessToken=...............REMOVED......................&feature=publishPresence&feature=presenceEvents connected=0 https=1>
2016-10-16 18:32:13.052355 MyApp[577:121739] [DEBUG TCSoundManager] TCSoundManager: sharedInstance: 0x0
2016-10-16 18:32:13.052423 MyApp[577:121739] [DEBUG TCSoundManager] TCSoundManager init, top
2016-10-16 18:32:13.052461 MyApp[577:121739] [VERBOSE TCSoundManager] TCSoundManager init, starting
2016-10-16 18:32:13.109491 MyApp[577:121739] [DEBUG TCSoundManager] TCSoundManager: player configured
2016-10-16 18:32:13.120029 MyApp[577:121739] [VERBOSE TCSoundManager] TCSoundManager init, done
2016-10-16 18:32:13.120917 MyApp[577:121739] [DEBUG TCSoundManager] TCSoundManager: attempting to play item, (inside TCSoundManager play())
2016-10-16 18:32:13.121720 MyApp[577:121739] [DEBUG TCSoundManager] Player status: 0, inside observeValueForKeyPath:
[2016-10-16 18:32:13.123] Caller.swift:55 DEBUG: Twilio connection created successfully
2016-10-16 18:32:13.136004 MyApp[577:121739] [DEBUG TCSoundManager] Player status: 1, inside observeValueForKeyPath:
2016-10-16 18:32:13.145341 MyApp[577:121739] [DEBUG TCSoundManager] Item status: 1, inside observeValueForKeyPath:
2016-10-16 18:32:13.226409 MyApp[577:121739] [DEBUG TCHttpJsonLongPollConnection] Inside beginning of onSocket:didConnectToHost
2016-10-16 18:32:13.226632 MyApp[577:121739] [DEBUG TCHttpJsonLongPollConnection] Starting TLS with settings:
{
    kCFStreamSSLPeerName = "*.twilio.com";
    kCFStreamSSLValidatesCertificateChain = 1;
    kCFStreamSocketSecurityLevelNegotiatedSSL = kCFStreamPropertySocketSecurityLevel;
}, inside onSocket:didConnectToHost:
2016-10-16 18:32:13.227088 MyApp[577:121739] [DEBUG TCEventStream] Inside longPollConnectionDidConnect:, stream <TCEventStream: 0x17427cbc0> connected
2016-10-16 18:32:13.227331 MyApp[577:121739] [DEBUG TCHttpJsonLongPollConnection] REQUEST: URL: https://matrix.twilio.com/2012-02-09/.............REMOVED............/TestName?AccessToken=..........................................REMOVED..................................&feature=publishPresence&feature=presenceEvents   GET /2012-02-09/........REMOVED............/ProjectName App?AccessToken=................................REMOVED....................................&feature=publishPresence&feature=pres
2016-10-16 18:32:14.028697 MyApp[577:121739] [DEBUG TCHttpJsonLongPollConnection] Inside beginning of onSocket:didReadData
2016-10-16 18:32:14.028836 MyApp[577:121739] [VERBOSE TCHttpJsonLongPollConnection] Received 
HTTP/1.0 400 Bad request
Cache-Control: no-cache
Connection: close
Content-Type: text/html

, inside onSocket:didReadData
2016-10-16 18:32:14.029065 MyApp[577:121739] [DEBUG TCEventStream] Inside longPollConnection:didReceiveHeaders:, stream <TCEventStream: 0x17427cbc0> got headers
2016-10-16 18:32:14.030074 MyApp[577:121739] [DEBUG TCEventStream] Inside longPollConnection:didFailWithError:, stream <TCEventStream: 0x17427cbc0> disconnected, error Error Domain=com.twilio.client.TCHttpErrorDomain Code=4 "HTTP server returned non-success status" UserInfo={com.twilio.client.TCHttpStatusCodeKey=400, NSLocalizedDescription=HTTP server returned non-success status}
2016-10-16 18:32:15.017604 MyApp[577:121739] [INFO TCSoundManager] TCSoundManager: playerItemDidReachEnd: 7466A900, (inside playerItemDidReachEnd)
2016-10-16 18:32:15.017913 MyApp[577:121739] [DEBUG TCCommandHandler] Inside postCommand:, received command of type TCMakeCallCommand
2016-10-16 18:32:15.018535 MyApp[577:121739] [DEBUG TCSoundManager] Player status: 1, inside observeValueForKeyPath:
2016-10-16 18:32:21.396771 MyApp[577:121739] [DEBUG Twilio] Application is in background
2016-10-16 18:32:21.397023 MyApp[577:121739] Legacy VoIP background mode is deprecated and no longer supported

What can be the issue?

Answer 1

It's quite difficult not seeing a code (with parameters you entered) to determine what the real problem is. But I will try. There are two issues in your log file:

1. 400 BAD REQUEST means: the data given in the HTTP POST or PUT failed validation.

2. longPollConnection : didFailWithError means: the server is not available and doesn't respond and/or send the new information. ––––––––––––––––––––––––––––––––––––––––––––

   2016-10-16 18:32:14.030074 MyApp[577:121739] [DEBUG TCEventStream] Inside longPollConnection:didFailWithError:, stream <TCEventStream: 0x17427cbc0> disconnected, error Error Domain=com.twilio.client.TCHttpErrorDomain Code=4 "HTTP server returned non-success status" UserInfo={com.twilio.client.TCHttpStatusCodeKey=400, NSLocalizedDescription=HTTP server returned non-success status}
   

Here are possible solutions for you:

1. Reset Xcode and iOS Simulator: How to Reset Xcode and the iOS Simulator and SO post

2. Update your Podfile if it's necessary: Pod install vs. pod update

3. Read the article about possible problem: What is HTTP Long Polling?

4. Watch this useful video: Advanced Debugging and the Address Sanitizer

5. Double-check these parameters: Voice: Twilio's request

6. If you are writing your own client, you need to set the HTTP Content-Type header to application/x-www-form-urlencoded for your requests.

7. You should inspect a response body for details.

And there are other useful references:

Sending SMS text message using twilio not working

Twilio: REST API: making calls

¡Hope this helps!