FWIW, you can use libcurl with Mojo via Net::Curl::Promiser::Mojo. That may be 
your easiest solution?

-FG

> On May 14, 2020, at 07:38, 'Michael Lackhoff' via Mojolicious 
> <mojolicious@googlegroups.com> wrote:
> 
> 
>> Am 14.05.2020 um 05:08 schrieb Stefan Adams:
>> > I'm certain you'll be able to accomplish this with M::UA. Can you share
> Just to reduce complexity I changed everything to plain HTTP, so no SSL,
> keys or certificates.
> 
>> > what the HTML error produced is?
> It is not really a normal error page, just a page from the UI. The most
> relevant lines are these:
> <p class="ErrorMsg">Invalid variable name.</p>
> <p>Wiederholen Sie das Update oder starten Sie die FRITZ!Box neu.</p>
> [German for: repeat the update(sic! I wanted to backup the box, not
> update) or restart your FRITZ!Box]
> 
>> > Can you share the output that you are comparing that you are noticing is so
>> > similar between curl and M::UA? You're using -v for curl. Also set the
>> > MOJO_CLIENT_DEBUG env variable to 1.
> Here is what curl gives (with --trace-ascii):
> => Send header, 200 bytes (0xc8)
> 0000: POST /cgi-bin/firmwarecfg HTTP/1.1
> 0024: Host: fritz.box
> 0035: User-Agent: curl/7.58.0
> 004e: Accept: */*
> 005b: Content-Length: 370
> 0070: Content-Type: multipart/form-data; boundary=--------------------
> 00b0: ----565a580ebeb0c567
> 00c6:
> => Send data, 370 bytes (0x172)
> 0000: --------------------------565a580ebeb0c567
> 002c: Content-Disposition: form-data; name="sid"
> 0058:
> 005a: 4e240384c30c909d
> 006c: --------------------------565a580ebeb0c567
> 0098: Content-Disposition: form-data; name="ImportExportPassword"
> 00d5:
> 00d7: backup
> 00df: --------------------------565a580ebeb0c567
> 010b: Content-Disposition: form-data; name="ConfigExport"
> 0140:
> 0142:
> 0144: --------------------------565a580ebeb0c567--
> <= Recv header, 17 bytes (0x11)
> 0000: HTTP/1.1 200 OK
> 
> 
>> > See how it works comparing curl to:
>> > 
>> >    $ env MOJO_CLIENT_DEBUG=1 mojo get -v -M POST -f sid=$SID -f
>> > ImportExportPassword=$BAKPWD -f ConfigExport= http
>> > ://fritz.box/cgi-bin/firmwarecfg <http://fritz.box/cgi-bin/firmwarecfg>
> The empty ConfigExport parameter gets lost with this command and the
> Content-Type is different:
> 
> -- Blocking request (http://fritz.box/cgi-bin/firmwarecfg)
> -- Connect 7c84d2d7396d9d2ff9571982f73240cb (http://fritz.box:80)
> -- Client >>> Server (http://fritz.box/cgi-bin/firmwarecfg)
> POST /cgi-bin/firmwarecfg HTTP/1.1\x0d
> Content-Length: 48\x0d
> User-Agent: Mojolicious (Perl)\x0d
> Accept-Encoding: gzip\x0d
> Content-Type: application/x-www-form-urlencoded\x0d
> Host: fritz.box\x0d
> \x0d
> ImportExportPassword=backup&sid=4e240384c30c909d
> -- Client >>> Server (http://fritz.box/cgi-bin/firmwarecfg)
> 
> -- Client <<< Server (http://fritz.box/cgi-bin/firmwarecfg)
> HTTP/1.1 200 OK\x0d
> 
> 
> 
> With DEBUG on and my code (s. my original message and below) I get this:
> 
> -- Client >>> Server (http://fritz.box/cgi-bin/firmwarecfg)
> POST /cgi-bin/firmwarecfg HTTP/1.1\x0d
> Accept-Encoding: gzip, deflate\x0d
> Content-Type: multipart/form-data; boundary=tyUPX\x0d
> Accept: */*\x0d
> Host: fritz.box\x0d
> Content-Length: 230\x0d
> User-Agent: Mojolicious (Perl)\x0d
> \x0d
> --tyUPX\x0d
> 
> -- Client >>> Server (http://fritz.box/cgi-bin/firmwarecfg)
> Content-Disposition: form-data; name="ConfigExport"\x0d
> \x0d
> 
> -- Client >>> Server (http://fritz.box/cgi-bin/firmwarecfg)
> \x0d
> --tyUPX\x0d
> 
> -- Client >>> Server (http://fritz.box/cgi-bin/firmwarecfg)
> Content-Disposition: form-data; name="ImportExportPassword"\x0d
> \x0d
> 
> -- Client >>> Server (http://fritz.box/cgi-bin/firmwarecfg)
> backup
> -- Client >>> Server (http://fritz.box/cgi-bin/firmwarecfg)
> \x0d
> --tyUPX\x0d
> 
> -- Client >>> Server (http://fritz.box/cgi-bin/firmwarecfg)
> Content-Disposition: form-data; name="sid"\x0d
> \x0d
> 
> -- Client >>> Server (http://fritz.box/cgi-bin/firmwarecfg)
> 33cb272bcd34940b
> -- Client >>> Server (http://fritz.box/cgi-bin/firmwarecfg)
> \x0d
> --tyUPX--\x0d
> 
> -- Client >>> Server (http://fritz.box/cgi-bin/firmwarecfg)
> 
> -- Client <<< Server (http://fritz.box/cgi-bin/firmwarecfg)
> HTTP/1.1 200 OK\x0d
> 
> which for me looks very much the same as the curl version but as I said,
> curl gives the backup file whereas M::U just gives the HTML page back,
> indicating that something went wrong.
> I can only spot very minor differences that is why I am running out of
> ideas:
> - the boundary used by M::U is quite short
> - the form parameters are not in the same order
> - Accept-Encoding header (is also sent from Firefox where it works)
> - the different SID is normal (my script always makes a fresch login)
> 
> Looks very strange to me
> -Michael
> 
>> > On Wed, May 13, 2020, 4:56 PM 'Michael Lackhoff' via Mojolicious <
>> > mojolicious@googlegroups.com> wrote:
>> > 
>>> >> I had quite a bit of success recently using Mojo::UserAgent so I tried to
>>> >> replace a curl command to do a backup of my Fritz.box router with M::U.
>>> >>
>>> >> Here is the curl command:
>>> >> curl -s -k -o $OUT --form sid=$SID --form ImportExportPassword=$BAKPWD \
>>> >>         --form ConfigExport= http://fritz.box/cgi-bin/firmwarecfg
>>> >>
>>> >> It should be equivalent to this M::U request:
>>> >>
>>> >> my $tx = $ua->build_tx(
>>> >>     POST => 'http://fritz.box/cgi-bin/firmwarecfg' =>
>>> >>         {
>>> >>             'Accept'       => '*/*',
>>> >>             'Content-Type' => 'multipart/form-data',
>>> >>         } => form => {
>>> >>             sid                  => $SID,
>>> >>             ImportExportPassword => $BAKPWD,
>>> >>             ConfigExport         => '',
>>> >>     }
>>> >> );
>>> >>
>>> >> # for debugging:
>>> >> print $tx->req->to_string;
>>> >>
>>> >> $tx = $ua->start($tx);
>>> >> $tx->res->save_to($OUT);
>>> >>
>>> >> As far as I can tell both the headers and the POST body is very much the
>>> >> same (except the boundary value to separate the form fields) but to my
>>> >> surprise the curl command works ($OUT is the backup file) but with the 
>>> >> M::U
>>> >> version $OUT consists of some HTML output indicating an error.
>>> >>
>>> >> If I could see a difference I could try to better adjust my script but as
>>> >> I said, they look very much the same (I compared it with the -v and
>>> >> --trace-ascii output of curl), so I run out of ideas what could trigger 
>>> >> the
>>> >> differnt response of my Fritz.box.
>>> >> Any ideas? At the moment I just solve it by using the curl command with
>>> >> "system" but I would prefer a Perl-only solution and what is even more
>>> >> important to me: I want to understand what is going on here.
>>> >>
>>> >> -Michael
>>> >>
>>> >> --
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>>> >> .
>>> >>
>> > 
> 
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