Bug ID 588888: Empty URI rewriting is not done as required by browser.

Last Modified: Sep 13, 2023

Affected Product(s):
BIG-IP APM(all modules)

Known Affected Versions:
11.5.1 HF1, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.1 HF10, 11.5.1 HF11, 11.5.2 HF1, 11.5.3 HF1, 11.5.3 HF2, 11.5.4 HF1, 11.5.4 HF2, 11.5.4 HF3, 11.5.4 HF4, 12.0.0, 12.0.0 HF1, 12.1.0 HF1, 12.0.0 HF2, 12.1.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2, 12.1.0, 12.1.1

Fixed In:
13.0.0, 12.1.2, 11.6.1 HF1

Opened: Apr 21, 2016

Severity: 3-Major

Related Article: K80124134


Empty URI must be rewritten at server side and client side rewriter in the same way: as empty URI (all browsers treat this type of URI in a specific way).


Web application malfunction, such as incorrect or unexpected behavior or error messages.


A tag with an empty 'src' or 'href' attribute.


Use an application-specific iRule that modifies the empty URI. -- For example, for JavaScript methods such as setAttribute(), an iRule should change this: 'F5_Invoke_setAttribute(o, "src", uri)' to this: '(uri=="")?o.setAttribute("src", uri):F5_Invoke_setAttribute(o, "src", uri)'. -- As another example, for JavaScript methods such as write(str), writeln(str), innerHTML=str, outerHTML=str, and similar methods, if str contains <img src="" ... >, the iRule must remove the src attribute.

Fix Information

This release fixes the issue of rewriting the empty URI the same way at the server side and client side: as empty URI (all browsers treat this type of URI in a specific way).

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips