AppExpert Applications and Templates
Configure application authentication, authorization, and auditing
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Advanced Policy Expressions: Working with Dates, Times, and Numbers
Advanced Policy Expressions: Parsing HTTP, TCP, and UDP Data
Expressions for Identifying the Protocol in an Incoming IP Packet
Expressions for Extracting Segments of URLs
Expressions for HTTP Status Codes and Numeric HTTP Payload Data Other Than Dates
Operations for HTTP, HTML, and XML Encoding and “Safe” Characters
Expressions for Evaluating a DNS Message and Identifying Its Carrier Protocol
Advanced Policy Expressions: IP and MAC Addresses, Throughput, VLAN IDs
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Expressions for extracting segments of URLs
You can extract URLs and portions of URLs, such as the host name, or a segment of the URL path. For example, the following expression identifies HTTP requests for image files by extracting image file suffixes from the URL:
http.req.url.suffix.eq("jpeg") || http.req.url.suffix.eq("gif")
Most expressions for URLs operate on text and are described inExpression Prefixes for Text in HTTP Requests and Responses. This section discusses the GET operation. The GET operation extracts text when used with the following prefixes:
- HTTP.REQ.URL.PATH
- VPN.BASEURL.PATH
- VPN.CLIENTLESS_BASEURL.PATH
The following table describes prefixes for HTTP URLs.
URL Prefix | Description |
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HTTP.REQ.URL.PATH.GET( |
Returns a slash- (“/”) separated list from the URL path. For example, consider the following URL: . The following expression returns dir1 from this URL: . The following expression returns dir2: http.req.url.path.get(2) |
HTTP.REQ.URL.PATH.GET_REVERSE( |
Returns a slash- (“/”) separated list from the URL path, starting from the end of the path. For example, consider the following URL: . The following expression returns index.html from this URL: . The following expression returns dir3: http.req.url.path.get_reverse(1) |
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