Error creating watch for my calender using Google calendar API - bad request

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I am trying to create a Watch for my Calendar using Google Calendar API...However when i trying to create it is throwing an exception as "The remote server returned an error: (400) Bad Request."

What I have tried:

HttpWebRequest request1 = (HttpWebRequest)WebRequest.Create("https://www.googleapis.com/calendar/v3/calendars/floristpanel@gmail.com/events/watch");
request1.Method = "POST";

request1.Headers.Add("Authorization", "Bearer " + accesstoken);
request1.ContentType = "application/json";

string postData1 = "type=web_hook&id=01234567-89ab-cdef-0123456789ab&address=https://www.hanafloralpos.com/notification.aspx";
byte[] bytes1 = Encoding.UTF8.GetBytes(postData1);
request1.ContentLength = bytes1.Length;

Stream requestStream1 = request1.GetRequestStream();
requestStream1.Write(bytes1, 0, bytes1.Length);

WebResponse response1 = request1.GetResponse();
Stream stream1 = response1.GetResponseStream();
StreamReader reader1 = new StreamReader(stream1);

var result1 = reader1.ReadToEnd();
stream1.Dispose();
reader1.Dispose();

Posted 6-Mar-17 18:57pm

vamsi2710

Updated 6-Mar-17 19:06pm

Graeme_Grant

v2

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Graeme_Grant · Answer 1 · 2017-03-06T19:06:00

Solution 1

I work with the Google Drive API but the principle is the same.

You need to not just look at the status code but also the response data returned. Here is an example of a Bad (Google Drive) Request:

POST https://www.googleapis.com/oauth2/v4/token HTTP/1.1
Host: www.googleapis.com
Content-Type: application/x-www-form-urlencoded
Content-Length: 65
Expect: 100-continue
Connection: Keep-Alive

client_id=&client_secret=&grant_type=refresh_token&refresh_token=

and google's response data

HTTP/1.1 400 Bad Request
Vary: X-Origin
Content-Type: application/json; charset=UTF-8
Date: Tue, 07 Mar 2017 06:02:05 GMT
Expires: Tue, 07 Mar 2017 06:02:05 GMT
Cache-Control: private, max-age=0
X-Content-Type-Options: nosniff
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block
Server: GSE
Alt-Svc: quic=":443"; ma=2592000; v="36,35,34"
Accept-Ranges: none
Vary: Origin,Accept-Encoding
Transfer-Encoding: chunked

{
 "error": "invalid_request",
 "error_description": "Missing required parameter: refresh_token"
}

UPDATED

This is the API page for the endpoint that you are calling: Events: watch | Google Calendar API | Google Developers[^]

The document states that the request is a Json packet:

In the request body, supply data with the following structure:

{
  "id": string,
  "token": string,
  "type": string,
  "address": string,
  "params": {
    "ttl": string
  }
}

Your data is in the incorrect form. So you are correctly receiving the Parse Error response.

UPDATE 2 re: Authorization Error

You need to Authenticate first, to gain access to your private data, before you can post changes. Authentication is more than the code that you have provided for your problem. You need to complete the steps in the following link: [^]

Once you have resolved the Authorization Error, then you can try creating your webhook.

Posted 6-Mar-17 19:06pm

Graeme_Grant

Updated 6-Mar-17 22:50pm

v3

Comments

vamsi2710 7-Mar-17 1:14am

I am trying to create it programatically and i am not able to see the response results...Can you let me know where and how can i see my bad request details

Graeme_Grant 7-Mar-17 1:18am

in the response body ... read the response like you would any data returned.

Graeme_Grant 7-Mar-17 1:19am

if you want to "peek" at the data, then use a tool like: Fiddler free web debugging proxy[^]

vamsi2710 7-Mar-17 1:20am

This is what i get in the Stack trace in the Response

at System.Net.HttpWebRequest.GetResponse()
at calendarquickstart.Program.Main(String[] args) in c:\users\haanapoc\documents\visual studio 2010\Projects\calendarquickstart\calendarquickstart\Program.cs:line 95
at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)

vamsi2710 7-Mar-17 1:32am

HTTP/1.1 400 Bad Request
Vary: X-Origin
Content-Type: application/json; charset=UTF-8
Date: Tue, 07 Mar 2017 06:30:57 GMT
Expires: Tue, 07 Mar 2017 06:30:57 GMT
Cache-Control: private, max-age=0
X-Content-Type-Options: nosniff
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block
Server: GSE
Alt-Svc: quic=":443"; ma=2592000; v="36,35,34"
Accept-Ranges: none
Vary: Origin,Accept-Encoding
Transfer-Encoding: chunked

ab
{
"error": {
"errors": [
{
"domain": "global",
"reason": "parseError",
"message": "Parse Error"
}
],
"code": 400,
"message": "Parse Error"
}
}

0

Graeme_Grant 7-Mar-17 1:54am

parseError suggests that the data you are sending is not in the correct format.

Graeme_Grant 7-Mar-17 1:58am

Updated my solution with additional information.

vamsi2710 7-Mar-17 2:26am

Hi Grant,

Thanks for the Reply...I have made the changes as you have asked..Now i am getting the response as :" 401: UnAuthorized Error"

Can you please help me out reg this

HttpWebRequest request1 = (HttpWebRequest)WebRequest.Create("https://www.googleapis.com/calendar/v3/calendars/floristpanel@gmail.com/events/watch");
request1.Method = "POST";

request1.Headers.Add("Authorization", "Bearer " + accesstoken);
request1.ContentType = "application/json";

using (var streamWriter = new StreamWriter(request1.GetRequestStream()))
{
string json = "{\"type\":\"web_hook\"," +
"\"address\":\"https://www.hanafloralpos.com/notification.aspx\"," +
"\"token\":\"ya29.dsgfjksdgjkfgskdjhfksdhhdfhsdkl\"," +
"\"id\":\"01234567-89ab-cdef-0123456789ab\"}";
streamWriter.Write(json);
streamWriter.Flush();
streamWriter.Close();
}

var httpResponse = (HttpWebResponse)request1.GetResponse();
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
var result = streamReader.ReadToEnd();
}

Graeme_Grant 7-Mar-17 2:30am

You know that google has their own C# API lib right? Will make your life that much easier... I have a custom lib because of our advanced requirements...

API Client Library for .NET | Google Developers[^]

vamsi2710 7-Mar-17 2:35am

Hi,

Thanks for the response.I have tried in Library you have provided and i get the error as :

{
"error": {
"errors": [
{
"domain": "global",
"reason": "push.webhookUrlUnauthorized",
"message": "Unauthorized WebHook callback channel: https://www.hanafloralpos.com/notification.aspx"
}
],
"code": 401,
"message": "Unauthorized WebHook callback channel: https://www.hanafloralpos.com/notification.aspx"
}
}

Graeme_Grant 7-Mar-17 2:56am

With a quick google I can see many others have encountered this same problem and you may find your answer here: google api Unauthorized WebHook callback channel - Google Search[^]

I suspect that this is the answer that you are looking for: java - Google push notifications - Unauthorized WebHook callback channel - Stack Overflow[^] (Ignore that it is Java)

vamsi2710 7-Mar-17 3:50am

I have reegistered my domain n the same way...But i am not sure still why i am getting the Unauthorized error...Can you please help me out reg this...I can send you teh code if needed

Graeme_Grant 7-Mar-17 4:06am

I'm neck deep in complex XML code, so I can't help you unless you want to do my work for me...

But quickly, the error is what it is - you are not passing a valid authorization token. you can read more about it here:
Authorizing API requests[^]

vamsi2710 7-Mar-17 4:18am

I have added the request token generated but still getting the same issue :(

HttpWebRequest request1 = (HttpWebRequest)WebRequest.Create("https://www.googleapis.com/calendar/v3/calendars/floristpanel@gmail.com/events/watch");
request1.Method = "POST";

request1.Headers.Add("Authorization", "Bearer " + accesstoken);
request1.ContentType = "application/json";

using (var streamWriter = new StreamWriter(request1.GetRequestStream()))
{
string json = "{\"type\":\"web_hook\"," +
"\"address\":\"https://www.hanafloralpos.com/notificationnew.aspx\"," +
"\"token\":\"ya29.GlsHBHxTCEnbrV-B_cz-YJpNRUTJlVKiDZTw1Tpl65xuWkeXfdFuwzS5UMxUQV641raB11tZHkjdhmHfqO28d3gtNSV6Ux8m02DRyfeXUr-F5rJ8LBTqPksD31UT\"," +
"\"id\":\"01234567-89ab-cdef-0123456789ab\"}";
streamWriter.Write(json);
streamWriter.Flush();
streamWriter.Close();
}

var httpResponse = (HttpWebResponse)request1.GetResponse();
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
var result = streamReader.ReadToEnd();
}

Graeme_Grant 7-Mar-17 4:30am

Did you read the documentation link that I provided? Are you able to authenticate?

PS: Don't post code in replies, that is what the Question is for. Please click on Improve question and update with this extra information.

vamsi2710 7-Mar-17 4:33am

No i am not able to authenticate...It is throwing the same Unauthorized error....Can you please spare few mins looking into the code at my end...As this is getting on my nerves :(

Graeme_Grant 7-Mar-17 4:36am

you need to do this first before you can post data. Authentication is more than the code provided. You need to complete the steps in the link that was provided. If OAuth 2.0 is too hard, then use their lib.

vamsi2710 7-Mar-17 4:34am

I have tried verifying the same in following url : https://developers.google.com/google-apps/calendar/v3/reference/events/watch

by providing the parameters : calendarId : floristpanel@gmail.com

I am not passing the token as its mentioned as optional...

{
"id": "01234567-89ab-cdef-0123456789abc",
"type": "web_hook",
"address": "https://www.hanafloralpos.com/notificationnew.aspx",
"params": {
"ttl": "640000"
},
}

Graeme_Grant 7-Mar-17 4:37am

Again, don't post this info here, add it to the question so others can see.

vamsi2710 7-Mar-17 4:40am

ok i will add...but can you please let me know what am i missing or doing it wrong

vamsi2710 7-Mar-17 4:44am

I am getting this exception :

"domain": "global",
"reason": "push.webhookUrlUnauthorized",
"message": "Unauthorized WebHook callback channel: https://www.hanafloralpos.com/notificationnew.aspx"