Curl says it cannot resolve host but host can be resolved - http

Question

I replaced mywebsite with the correct website that can be resolved when I run curl www.mywebsite.com. These are the options I am using:
curl -X 'GET https://www.mywebsite.com/Web2/PDF.aspx?page=1' \
-H 'Host: www.mywebsite.org' \
-H 'Connection: keep-alive' \
-H 'Upgrade-Insecure-Requests: 1' \
-A 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.119 Safari/537.36 OPR/51.0.2830.26' \
-H 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8' \
-H 'DNT: 1' \
-e 'the-referer' \
-H 'Accept-Encoding: gzip, deflate, br' \
-H 'Accept-Language: en-US,en;q=0.9' \
-b '_the-cookies'
When I try to run this in OSX terminal, the following happens:
$ curl -X 'GET https://www.mywebsite.com/Web2/PDF.aspx?page=1' \
-H 'Host: www.mywebsite.org' \
-H 'Connection: keep-alive' \
-H 'Upgrade-Insecure-Requests: 1' \
-A 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.119 Safari/537.36 OPR/51.0.2830.26' \
curl: (6) Could not resolve host:
Mac-mini-3:~ myuser$
It says:
curl: (6) Could not resolve host:
Why is this happening? And why is it trying to run commands when I used the \ escape sequence in terminal? It should not be running any commands until all the options are passed.

Answer 1

Because you have not specified a host. The host is specified as a request command (part of -X arg).
You need to have (note the placement of single quote)
curl -X GET 'https://www.mywebsite.com/Web2/PDF.aspx?page=1' ...