bsd.port.mk FETCH_ARGS defaults, why "-A" ?

[John Marino]

On 12/28/2013 01:49, Dimitry Andric wrote:
> On 28 Dec 2013, at 01:12, John Marino <freebsd.contact at marino.st> wrote:
>> For months I've been getting a lot of fetch failures in ports that I
>> couldn't reproduce outside of them.  It appears it is caused by the
>> default "-A" passed to fetch.
>>
>> For example, /usr/ports/emulators/javatari will fail with "make fetch"
>> but it will succeed with with "make fetch FETCH_ARGS=-Fpr"
>>
>> I'd like to understand why "-A" is the default.  Clearly many distfiles
>> could be retrieved that aren't, so I'd like to know what -A is saving us
>> from, and why that would be worse than the current situation?
> 
> Crappy download sites that redirect you to ad pages, malware domains, or worse?
> 

And?
The checksum won't match, and the next site in the MASTER_SITES list
will be checked, right?  What is the downside of this redirect?  Keep in
mind that the site was once "approved" by the port maintainer, it's not
some random URL stuck in a wiki.