View POST request body in Application Insights

by

You can simply implement your own Telemetry Initializer:

For example, below an implementation that extracts the payload and adds it as a custom dimension of the request telemetry:

public class RequestBodyInitializer : ITelemetryInitializer
{
    public void Initialize(ITelemetry telemetry)
    {
        var requestTelemetry = telemetry as RequestTelemetry;
        if (requestTelemetry != null && (requestTelemetry.HttpMethod == HttpMethod.Post.ToString() || requestTelemetry.HttpMethod == HttpMethod.Put.ToString()))
        {
            using (var reader = new StreamReader(HttpContext.Current.Request.InputStream))
            {
                string requestBody = reader.ReadToEnd();
                requestTelemetry.Properties.Add("body", requestBody);
            }
        }
    }
}

Then add it to the configuration either by configuration file or via code:

TelemetryConfiguration.Active.TelemetryInitializers.Add(new RequestBodyInitializer());

Then query it in Analytics:

requests | limit 1 | project customDimensions.body

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