Web API request content is empty
I have a DelegatingHandler implementation to log the content of the request / response:
public class RequestAndResponseLoggerDelegatingHandler : DelegatingHandler
{
public IDataAccess Data { get; set; }
protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
{
var started = DateTime.UtcNow;
var response = await base.SendAsync(request, cancellationToken);
await Log(started, request, response);
return response;
}
private async Task Log(DateTime start, HttpRequestMessage request, HttpResponseMessage response)
{
var finished = DateTime.UtcNow;
var requestContent = await request.Content.ReadAsStringAsync();
var responseContent = await response.Content.ReadAsStringAsync();
var info = new ApiLogEntry(start, finished, requestContent, responseContent, request, response);
Data.Log(info);
}
}
but for some reason requestContent
comes up empty. request.Content.Length
confirms there is content, it just isn't being retrieved.
Any ideas?
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1 answer
The stream of the request body is read and bound to parameters, and as a result of the binding, the stream is placed at the end. This is why it becomes empty. If you're looking for a start before request.Content.ReadAsStringAsync()
, it should work. Instead, you can simply read the body of the request before the binding happens, something like this.
public class RequestAndResponseLoggerDelegatingHandler : DelegatingHandler
{
public IDataAccess Data { get; set; }
protected override async Task<HttpResponseMessage> SendAsync(
HttpRequestMessage request,
CancellationToken cancellationToken)
{
var started = DateTime.UtcNow;
var requestContent = await request.Content.ReadAsStringAsync();
var response = await base.SendAsync(request, cancellationToken);
var responseContent = await response.Content.ReadAsStringAsync();
await Log(started, request, response, requestContent, responseContent);
return response;
}
private async Task Log(DateTime start, HttpRequestMessage request,
HttpResponseMessage response, string requestContent,
string responseContent)
{
var finished = DateTime.UtcNow;
var info = new ApiLogEntry(start, finished, requestContent, responseContent,
request, response);
Data.Log(info);
}
}
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