Added Content-Length header to Ch 20-01 listings. #2589
Merged
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Added Content-Length header to listing 20-07 and listing 20-09. Removed the explanation about not returning headers.
When the Content-Length header was added in listing 20-05 for the success case in #2246 the Content-Length header was not added to the error case in listing 20-07 or the refactored code in listing 20-09.
References #1324
Closes #2434