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Image Serving HTTP encoding

Command values must be http-encoded using %xx escape sequences, such that the value strings do not include the reserved characters '=', '&', and '%'.
Otherwise, standard HTTP encoding rules apply. The HTTP specification requires encoding of the unsafe characters, as well as any control characters, such as <return> and <tab> . URL encoding of a character consists of a "%" symbol, followed by the two-digit hexadecimal representation (case-insensitive) of the ISO-Latin code point for the character. The unsafe characters and code points are:
Unsafe character Code points (hex) Code points (dec)
Space
20
32
<
3C
60
>
3E
62
"
22
34
#
23
35
%
25
37
{
7B
123
}
7D
125
|
7C
124
\
5C
92
^
5E
94
~
7E
126
[
5B
91
]
5D
93
`
60
96
Reserved characters must also be encoded.
Reserved Character Code Points (Hex) Code Points (Dec)
$
24
36
&
26
38
+
2B
43
,
2C
44
/
2F
47
:
3A
58
;
3B
59
=
3D
61
?
3F
63
@
40
64

Example

…&$text=rate&weight=85% 27#&…
If obfuscation is not applied, the above request fragment must be encoded as follows:
…&$text=rate%26weight%3D85%25%2027%23&…
If obfuscation is applied, encoding can be limited to remove '=', '&', and '%' characters:
…&$text=rate%26weight%3D85%25 27#&…