PayPal payment method not working properly

I am redirecting users to PayPal's payment site by using this HTTP Location header. It is all in one line but I have broken it down for readability. Unfortunately, the fields in bold are not sent to PayPal's website. (The last one (email) is sent.) Anybody开发者_开发知识库 know why ?

Location: https://www.paypal.com/cgi-bin/webscr?

amount_1=100&

item_name_1=ProductName&

upload=1&

business=myemail%40mydomain.com&

cmd=_cart&

currency_code=USD&

item_number_1=12345&

country=US&

first_name=x&

last_name=x&

address1=x&

address2=x&

zip=x&

city=x&

email=x@domain.com&

\n\n

PayPal's Instructions Site

It said "address1 - Street (1 of 2 fields) - Alphanumeric - Limit 100"
Did you input more than 100 characters?
And make sure you entered a [SPACE] as %20 (URIencode).