我们多年来一直通过c＃客户端库（Google.Apis.Calendar.v3.1.9.2.1330）成功使用Google Contact和Calendar API。最近发生了一个不寻常的错误。似乎日历API调用正在获取联系API响应（请参阅下文）。有没有人遇到过这个问题并有解决方案来防止它再次发生？
编辑： 包括代码段：
using Google.Apis.Calendar.v3;
using Google.Apis.Calendar.v3.Data;
using Google.Apis.Http;
using Google.Apis.Services;
...
var eventList = service.Events.List(calendarListEntry.Id);
eventList.TimeMin = dateFrom;
eventList.TimeMax = dateTo;
eventList.SingleEvents = true;
var events = eventList.Execute().Items;
1.
"63577099854207364450, Request https://www.googleapis.com/calendar/v3/users/me/calendarList, req auth:Bearer xxx, headers:User-Agent: Datahug google-api-dotnet-client/1.9.3.19379 (gzip)
Authorization: Bearer xxx
, Thread50"
"63577099854637364450, Request https://www.googleapis.com/calendar/v3/calendars/eaxmple@domain.com/events?singleEvents=True&timeMax=2016-03-06T01:30:53.873Z&timeMin=2016-02-05T01:30:53.873Z, req auth:Bearer xxx, headers:User-Agent: Datahug google-api-dotnet-client/1.9.3.19379 (gzip)
Authorization: Bearer xxx
, Thread50"
"63577099854207364450, Request https://www.googleapis.com/calendar/v3/users/me/calendarList, req auth:Bearer xxx, Thread41, result:StatusCode: 200, ReasonPhrase: 'OK', Version: 1.1, Content: System.Net.Http.StreamContent, Headers:
{
Vary: Origin
Vary: X-Origin
X-Content-Type-Options: nosniff
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block
Alternate-Protocol: 443:quic,p=1
Alt-Svc: quic="":443""; p=""1""; ma=604800
Transfer-Encoding: chunked
Cache-Control: no-transform, must-revalidate, max-age=0, private
Date: Sun, 06 Sep 2015 01:30:54 GMT
Server: GSE
Content-Type: application/json; charset=UTF-8
Expires: Sun, 06 Sep 2015 01:30:54 GMT
}"
"63577099854637364450, Request https://www.googleapis.com/calendar/v3/calendars/eaxmple@domain.com/events?singleEvents=True&timeMax=2016-03-06T01:30:53.873Z&timeMin=2016-02-05T01:30:53.873Z, req **auth:Bearer xxx**, Thread29, result:StatusCode: 200, ReasonPhrase: 'OK', Version: 1.1, Content: System.Net.Http.StreamContent, Headers:
{
Vary: Origin
Vary: X-Origin
X-Content-Type-Options: nosniff
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block
Alternate-Protocol: 443:quic,p=1
Alt-Svc: quic="":443""; p=""1""; ma=604800
Transfer-Encoding: chunked
Cache-Control: no-transform, must-revalidate, max-age=0, private
Date: Sun, 06 Sep 2015 01:30:54 GMT
Server: **GSE**
Content-Type: application/json; charset=UTF-8
Expires: Sun, 06 Sep 2015 01:30:54 GMT
}"
"63577099856222364450, Request https://www.googleapis.com/calendar/v3/users/me/calendarList, req auth:Bearer yyy, headers:User-Agent: Datahug google-api-dotnet-client/1.9.3.19379 (gzip)
Authorization: Bearer yyy
, Thread50"
2. "63577099856222364450, Request https://www.googleapis.com/calendar/v3/users/me/calendarList, req **auth:Bearer yyy**, Thread42, result:StatusCode: 404, ReasonPhrase: 'Not Found', Version: 1.1, Content: System.Net.Http.StreamContent, Headers:
{
Connection: close
Date: Sun, 06 Sep 2015 01:30:56 GMT
Server: **GFE/2.0**
Content-Length: 1527
Content-Type: text/html; charset=UTF-8
}"
An Error occurred, but the error response could not be deserialized|The service calendar has thrown an exception: Google.GoogleApiException: An Error occurred, but the error response could not be deserialized ---> Newtonsoft.Json.JsonReaderException: **Unexpected character encountered while parsing value: <.** Path '', line 0, position 0.
at Newtonsoft.Json.JsonTextReader.ParseValue()
at Newtonsoft.Json.JsonTextReader.ReadInternal()
at Newtonsoft.Json.JsonTextReader.Read()
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.ReadForType(JsonReader reader, JsonContract contract, Boolean hasConverter)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent)
at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType)
at Newtonsoft.Json.JsonConvert.DeserializeObject(String value, Type type, JsonSerializerSettings settings)
at Newtonsoft.Json.JsonConvert.DeserializeObject[T](String value, JsonSerializerSettings settings)
at Google.Apis.Json.NewtonsoftJsonSerializer.Deserialize[T](String input) in c:\ApiaryDotnet\default\Src\GoogleApis.Core\Apis\Json\NewtonsoftJsonSerializer.cs:line 120
at Google.Apis.Services.BaseClientService.<DeserializeError>d__8.MoveNext() in c:\ApiaryDotnet\default\Src\GoogleApis\Apis\Services\BaseClientService.cs:line 286
--- End of inner exception stack trace ---
at Google.Apis.Requests.ClientServiceRequest`1.Execute() in c:\ApiaryDotnet\default\Src\GoogleApis\Apis\Requests\ClientServiceRequest.cs:line 102
at DataIntegration.Services.Google.ImportGmailCalenderService.ImportGmailCalendars(DateTime dateFrom, DateTime dateTo, Boolean validateResultsAreForCorrectAccount, ISet`1 internalDomainUrls, String email, String account) in c:\buildworkspaces\WebApp-BuildUnitTest-NextRelease\NextRelease\DataIntegration\Services\Google\ImportGmailCalendarService.cs:line 59
3. "63577099858032364450, Request https://www.googleapis.com/calendar/v3/users/me/calendarList, req auth:Bearer yyy, headers:User-Agent: Datahug google-api-dotnet-client/1.9.3.19379 (gzip)
Authorization: Bearer yyy
, Thread50"
"63577099858032364450, Request https://www.googleapis.com/calendar/v3/users/me/calendarList, req auth:Bearer yyy, Thread39, result:StatusCode: 200, ReasonPhrase: 'OK', Version: 1.1, Content: System.Net.Http.StreamContent, Headers:
{
Vary: Origin
Vary: X-Origin
X-Content-Type-Options: nosniff
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block
Alternate-Protocol: 443:quic,p=1
Alt-Svc: quic="":443""; p=""1""; ma=604800
Transfer-Encoding: chunked
Cache-Control: no-transform, must-revalidate, max-age=0, private
Date: Sun, 06 Sep 2015 01:30:58 GMT
Server: GSE
Content-Type: application/json; charset=UTF-8
Expires: Sun, 06 Sep 2015 01:30:58 GMT
}"
需要注意的几点：在有问题的请求/响应之前，auth bearer token已经被更改了。错误响应中的服务器与成功响应中的服务器不同。