optional accept-signature header in httpclient

Author: andygruening

Packages/Sequence-Unity/Sequence/SequenceSDK/EmbeddedWallet/SequenceLogin.cs

@@ -151,7 +151,7 @@ public void SetupAuthenticator(IValidator validator = null, IAuthenticator authe
             }
 
             _sessionId = IntentDataOpenSession.CreateSessionId(_sessionWallet.GetAddress());
-            _intentSender = new IntentSender(new HttpClient(WaaSWithAuthUrl), _sessionWallet, _sessionId, _waasProjectId, _waasVersion);
+            _intentSender = new IntentSender(new HttpClient(WaaSWithAuthUrl, true), _sessionWallet, _sessionId, _waasProjectId, _waasVersion);
 
             if (authenticator != null)
             {

Packages/Sequence-Unity/Sequence/SequenceSDK/Utils/Networking/HttpClient.cs

@@ -20,13 +20,15 @@ public class HttpClient : IHttpClient
             NullValueHandling = NullValueHandling.Ignore
         };
 
-        public HttpClient(string baseUrl)
+        public HttpClient(string baseUrl, bool acceptSignature = false)
         {
             _baseUrl = baseUrl;
             _defaultHeaders = new Dictionary<string, string>();
             _defaultHeaders["Content-Type"] = "application/json";
             _defaultHeaders["Accept"] = "application/json";
-            _defaultHeaders["Accept-Signature"] = "sig=()";
+            
+            if (acceptSignature)
+                _defaultHeaders["Accept-Signature"] = "sig=()";
         }
 
         public async Task<TResponse> SendPostRequest<TArgs, TResponse>(string path, TArgs args, Dictionary<string, string> headers = null)