URLs use the following encoding for characters that are not numbers or letters:
| Character | Description | Usage | Encoding |
| space | %20 | ||
| ; | semicolon | reserved | %3b |
| / | slash | reserved | %2f |
| ? | question mark | reserved | %3f |
| : | colon | reserved | %3a |
| @ | at sign | reserved | %40 |
| = | equals sign | reserved | %3d |
| & | ampersand | reserved | %26 |
| < | Less-than sign | unsafe | %3c |
| > | Greater-than sign | unsafe | %3e |
| “ | double quote | unsafe | %22 |
| # | hash symbol | unsafe | %23 |
| % | percent | unsafe | %25 |
| { | left curly brace | unsafe | %7b |
| } | right curly brace | unsafe | %7d |
| | | vertical bar | unsafe | %7c |
| \ | backslash | unsafe | %5c |
| ^ | caret | unsafe | %5e |
| ~ | tilde | unsafe | %7e |
| [ | left square bracket | unsafe | %5b |
| ] | right square bracket | unsafe | %5d |
| ' | single quote | unsafe | %60 |

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