use double quotes for httpRequest

* before this change, the $i try output told me, that he has done try: $i instead of try: 1 etc.
4 jobs for typo in 1 minute and 9 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Lint
passed #1359
lint:lint-php5.4

00:00:40

passed #1360
lint:lint-php5.6

00:00:39

passed #1361
lint:lint-php7.0

00:00:38

 
  Codesniffer
passed #1362
codesniffer

00:00:29