URL Encoding

Some common characters used by PI System features, such as AF resource names, may produce errors when included in a request URI. These characters must be percent-encoded according to RFC 3986, which defines the rules for URIs. Characters that must be percent-encoded are referred to as "reserved characters". For example, if you are trying to include an AF Element name like Element#&StartTime=01-01-17 in your request URI, you would need to percent-encode it like Element%23%26StartTime%3D01-01-17.

Table with common url encodings

Symbol	Escape Character
Space	%20
!	%21
"	%22
#	%23
$	%24
%	%25
&	%26
'	%27
(	%28
)	%29
*	%2A
+	%2B
,	%2C
-	%2D
.	%2E
/	%2F
:	%3A
;	%3B
<	%3C
=	%3D
>	%3E
?	%3F
@	%40