Symptoms

URL may contain a character sequence, &# (ampersand, pound) that is not a part of HTML entity, for instance: http://example.com/some/path?query&#fragment In this example, &# is not a beginning of a valid HTML entity and should be left untouched at rewriting.

Impact

URL with &# inside may not be rewritten.

Conditions

URL containing a &# character sequence that is not a part of HTML entity.

Workaround

Use an iRule with two steps: - Modifies the original URL to let it be rewritten. - Modifies the rewritten URL to revert changes made by 1st step, as shown in the following example: a) Original URL: http://example.com/path?aa=bb&#fragment. b) URL after 1st step of iRule: http://example.com/path?aa=bb&@F5_@#fragment. c) Rewritten URL before 2nd step of iRule: https://bigip.system.name.com/f5-w-687474703a2f2f6578616d706c652e636f6d$$/path?aa=bb&F5CH=I@F5_@#fragment. d) URI corrected by 2nd step of iRule: https://bigip.system.name.com/f5-w-687474703a2f2f6578616d706c652e636f6d$$/path?aa=bb&F5CH=I#fragment. In other words, the second step removes insertions made by the first step.

Fix Information

Now, a URL containing &# character sequences are rewritten correctly, even if the &# fragment does not belong to a valid HTML entity.

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips