Summary: Interestingly Phorge allows to paste a Phorge URL in the search bar to be redirected there... Now this interesting feature was crashing the whole search engine for simple queries like "asdasd" with the following exception message: Refusing to redirect to local resource "asdasd". This URI is not formatted in a recognizable way. You are affected by this crash after this commit: 328aee033fbdc704620e2facae4aa68b836217bb This specific commit is probably legitimate since "#asdasd" and "/asdasd" are indeed internal URIs, plus, yes, there are some undocumented and untested cases like "asdasd" that may be considered internal URIs as well. Or not. But this is just an undocumented corner-case. In short: PhabricatorDatasourceURIEngineExtension should not be built over undocumented corner-cases and should require an absolute URI, with at least a domain. Note that PhutilURI#getDomain() is always a string and never null, so we can do a strict check. This fix also involves a micro-optimization to avoid duplicate URI parsing. Since the method was calling the constructor PhutilURI(string) twice (line 13, line 24). Now just once. Closes T15763 Test Plan: Search "lol", no crash anymore. Copy a random Phorge URL and paste that in your search bar. It still redirects there. Reviewers: zhe, avivey, O1 Blessed Committers, speck Reviewed By: O1 Blessed Committers, speck Subscribers: speck, tobiaswiese, Matthew, Cigaryno Maniphest Tasks: T15763 Differential Revision: https://we.phorge.it/D25561