Remove logging of stream request bodies

[bajtos]

/cc @raymondfeng @chandadharap

[raymondfeng]

The usage of Scanner api is clearly documented by JDK with an example, see https://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html. It will be ridiculous that nobody can use the Scanner api because of a StackOverflow example. I propose that we fix the code in the following approach:

1. Remove the ref to SO
2. Add a ref to the official JSDoc
3. Rewrite the code per the official JSDoc