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What does the ^ sign in URL mean?

What is the meaning of the ^ sign in the URL?

I needed to scan some link data from a web page, and I used a simple handwritten PHP scanner for this. The caterpillar usually works great; then I came to a URL like this:

http://www.example.com/example.asp?x7=3^^^^^select%20col1,col2%20from%20table%20where%20recordid%3E=20^^^^^

This URL works fine when typing in a browser, but my crawler cannot get this page. I get the error "HTTP request failed."

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5 answers

Caret (^) is not a reserved character in URLs, so it should be acceptable to use as-is. However, if you are having problems, just replace it with hexadecimal encoding %5E.

, SQL URL-, "EXPLOIT ME PLEASE!". , , .

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, , URL- .

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^ , . RFC 1738 (URL):

, , . "{", "}", "|", "\", "^", "~", "[", "]", "".

URL

URL- ^.

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, "", " " URL-. URL-, . RFC2396:

2.2. Reserved Characters

   Many URI include components consisting of or delimited by, certain
   special characters.  These characters are called "reserved", since
   their usage within the URI component is limited to their reserved
   purpose.  If the data for a URI component would conflict with the
   reserved purpose, then the conflicting data must be escaped before
   forming the URI.

      reserved    = ";" | "/" | "?" | ":" | "@" | "&" | "=" | "+" |
                    "$" | ","

   The "reserved" syntax class above refers to those characters that are
   allowed within a URI, but which may not be allowed within a
   particular component of the generic URI syntax; they are used as
   delimiters of the components described in Section 3.

   Characters in the "reserved" set are not reserved in all contexts.
   The set of characters actually reserved within any given URI
   component is defined by that component. In general, a character is
   reserved if the semantics of the URI changes if the character is
   replaced with its escaped US-ASCII encoding.

2.3. Unreserved Characters

   Data characters that are allowed in a URI but do not have a reserved
   purpose are called unreserved.  These include upper and lower case
   letters, decimal digits, and a limited set of punctuation marks and
   symbols.

      unreserved  = alphanum | mark

      mark        = "-" | "_" | "." | "!" | "~" | "*" | "'" | "(" | ")"

   Unreserved characters can be escaped without changing the semantics
   of the URI, but this should not be done unless the URI is being used
   in a context that does not allow the unescaped character to appear.

2.4. Escape Sequences

   Data must be escaped if it does not have a representation using an
   unreserved character; this includes data that does not correspond to
   a printable character of the US-ASCII coded character set, or that
   corresponds to any US-ASCII character that is disallowed, as
   explained below.
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URL- , , , (^) . , URL- , ; , , !

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