Re: How to extract "Body size in bytes" from the http sampler result.

[Flavio Cysne]

Use Beanshell Post-Processor, inside the sample you want its body length,
with the code below:

response = prev.getResponseDataAsString();
data_length = new Integer(response.length());
vars.put("data_length", data_length.toString());

Then, you can use ${data_length} variable as desired.