Pushing an update to VSTS via REST API - rest

Question

I am struggling with pushing an update to an existing file in a VSTS Git repository.
The documentation https://learn.microsoft.com/en-us/rest/api/vsts/git/pushes/create#update_a_file shows what to do.
When I use GET instead of POST, I get all existing pushes. So basically the request is working. This is my URL https://mine.visualstudio.com/_apis/git/repositories/ad3d7615-6e4a-4988-bd3f-ca80d7ec9791/pushes?api-version=4.1-preview.
I am testing the request from a console application. The body is created from a dynamic that is serialized later. The filecontent is a string var x=1;.
dynamic body = new
{
refUpdates = new[] { new { name = "refs/heads/master", oldObjectId = branchObjectId } },
commits = new[] {
new {
comment = "Updated Configuration" ,
changes = new[] {
new {
changeType = "edit",
item = new { path = "/files/filename.js"},
newContent = new { content = filecontent, contentType = "rawtext" }
}
}
}
}
};
The request looks like this:
using (HttpClient client = new HttpClient())
{
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
byte[] login = Encoding.ASCII.GetBytes(string.Format("{0}:{1}", "", personalaccesstoken));
client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(login));
var content = new StringContent(body, Encoding.UTF8, "application/json");
using (HttpResponseMessage response = client.PostAsync(url, content).Result)
{
response.EnsureSuccessStatusCode();
string responseBody = await response.Content.ReadAsStringAsync();
responseBodyAction.Invoke(responseBody);
}
}
It is not successful, as the following Exception is thrown:
System.Net.Http.HttpRequestException: 'Response status code does not
indicate success: 404 (Not Found).
The body is a valid JSON.
Some API calls need the url .vsrm.visualstudio.com instead of .visualstudio.com. But not in this case.
I am out of ideas. Did anybody successfully push an update to VSTS and can show me how to do it?

Answer 1

As mentioned in a comment I was able to add instead of edit.
The solution is to first check in a file and then send an update/edit.
If there is no existing file, an edit will fail with the Exception.