Wait a minute. You've jogged my memory. When I installed let's encrypt on the live site, I changed the htaccess, I think.So maybe I need to change it back on the dev site.

OK. Thanks.

Every time I try to type http:// the browser inserts https://

No idea how/why that happened, or how to fix it.

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But Chrome also added the https. Hang on.

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Chrome says: This site can’t provide a secure connection

www.localhost sent an invalid response.
ERR_SSL_PROTOCOL_ERROR

Safari just keeps putting them back in. I'll try in Chrome.

Just in case there are people here who aren't there (with apologies for cross-posting):

Trouble with MAMP

Servers start OK and can reach phpinfo and index of site, but attempt to access admin of site gives:

Safari can’t open the page “https://www.localhost:8888/grav-blog/admin” because Safari can’t find the server “www.localhost”.

Help!

@height8 Thanks. By and large this is just me exercising my curiosity, but it also seems like I ought to know (and care) because people much smarter than me do.

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@height8 For someone who has no knowledge of mobile development, how would I know that something I use on my phone to do things is a web app or a native app? And would I, as an ordinary user, care?

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@height8 But in practice … ?

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