The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/11/ecpg-sql-connect.html
Description:
Please add the note about the limitation characters in connection string.
For example, I think that below explanation should be in the Parameter
section of connection_target.
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Note that this parameter does not allow the symbols with special meaning of
the URI parts, e.g. "&" and "?".
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I checked some symbols with special meaning of the URI parts whether it is
able to use in connection_target, and I could not connect to database with
the string containing "&" and "?".
I reported this limitation in pg-general.
https://www.postgresql.org/message-id/848B1649C8A6274AA527C4472CA11EDD5FC70CBE%40G01JPEXMBYT02