provide a method to extract response length for http servlet.

[rghetia]

In certain cases Content-Length header is not set in the response. In those case message size will not be recorded on the server side using opencensus-contrib-http-servlet. However some of the frame work provide another way to get the data. For example, jetty server has Response.getContentCount() method that returns the size of the response. Provide a method to retrieve content length based on the framework being used.

What version of OpenCensus are you using?

0.19.0

[songy23]

Is this fixed? Should this be part of the next release?

[rghetia]

this is not fixed.

[songy23]

I think this is fixed? @rghetia

[rghetia]

I think this is fixed? @rghetia

no, it is not fixed.