Fixing error IO::Socket::SSL 1.56 must be installed for https support

In the Perl programming language there are several libraries you can use to download data from the Internet Protocol HTTP. The most famous is LWP and HTTP::Tiny. Library HTTP::Tiny comes with Perl, it is not necessary to install additional, therefore, it is often convenient to download data with it.

Using Perl to get HTML page with http protocol

Here is an example of code that loads the home page http://example.com. In this example uses http and not https: 

#!/usr/bin/perl

use strict;
use warnings;
use feature qw(say);

use HTTP::Tiny;
use Data::Dumper;

my $response = HTTP::Tiny->new()->get('http://example.com');

warn Dumper $response;

If you run this code, you can see that everything works. Received the status of 200. The field successvalue is true (in this text for convenience of display, the data structures have fields content the value was changed, instead of the html code of the page written by three dots): 

$ perl script.pl
$VAR1 = {
          'reason' => 'OK',
          'protocol' => 'HTTP/1.1',
          'content' => '...',
          'headers' => {
                         'etag' => '"3147526947+gzip+ident"',
                         'x-cache' => 'HIT',
                         'connection' => 'close',
                         'cache-control' => 'max-age=604800',
                         'content-length' => '1256',
                         'server' => 'ECS (nyb/1D2A)',
                         'expires' => 'Mon, 30 Dec 2019 12:38:04 GMT',
                         'vary' => 'Accept-Encoding',
                         'content-type' => 'text/html; charset=UTF-8',
                         'date' => 'Mon, 23 Dec 2019 12:38:04 GMT',
                         'last-modified' => 'Thu, 17 Oct 2019 07:18:26 GMT'
                       },
          'url' => 'http://example.com',
          'success' => 1,
          'status' => '200'
        };

Error when using https

But if you change a little this code to load data over https, then the data is not loaded. Here is the code of the program: 

#!/usr/bin/perl

use strict;
use warnings;
use feature qw(say);

use HTTP::Tiny;
use Data::Dumper;

my $response = HTTP::Tiny->new()->get('https://example.com');

warn Dumper $response;

Here is the output from this program: 

$ perl script.pl
$VAR1 = {
          'url' => 'https://example.com',
          'reason' => 'Internal Exception',
          'status' => 599,
          'success' => '',
          'headers' => {
                         'content-type' => 'text/plain',
                         'content-length' => 57
                       },
          'content' => 'IO::Socket::SSL 1.56 must be installed for https support
'
        };

The value of the field status 599 (this special status was invented in the library HTTP::Tiny, it means that the problem is with the library). The value success is false, and the content there is an explanation of why the error occurred: IO::Socket::SSL 1.56 must be installed for https support.

Try to solve

Yeah. To HTTP::Tiny to work over https need to the library IO::Socket::SSL.

Try to put her with cpanm, but get the error: 

root@faf6a4b66b08:/app# cpanm IO::Socket::SSL
--> Working on IO::Socket::SSL
Fetching http://www.cpan.org/authors/id/S/SU/SULLR/IO-Socket-SSL-2.066.tar.gz ... OK
==> Found dependencies: Net::SSLeay
--> Working on Net::SSLeay
Fetching http://www.cpan.org/authors/id/C/CH/CHRISN/Net-SSLeay-1.88.tar.gz ... OK
Configuring Net-SSLeay-1.88 ... OK
Building and testing Net-SSLeay-1.88 ... FAIL
! Installing Net::SSLeay failed. See /root/.cpanm/work/1577105006.3284/build.log for details. Retry with --force to force install it.
! Installing the dependencies failed: Module 'Net::SSLeay' is not installed
! Bailing out the installation for IO-Socket-SSL-2.066.
root@faf6a4b66b08:/app#

As you can see from the log for the library IO::Socket::SSL need to install Net::SSLeay, but Net::SSLeay is not installed. In the file build.log you can see the details. Here's a snippet of that file: 

cp lib/Net/SSLeay.pod blib/lib/Net/SSLeay.pod
/usr/bin/perl /usr/share/perl/5.18/ExtUtils/xsubpp  -typemap /usr/share/perl/5.18/ExtUtils/typemap -typemap typemap  SSLeay.xs > SSLeay.xsc && mv SSLeay.xsc SSLeay.c
cc -c   -D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fstack-protector -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -O2 -g   -DVERSION=\"1.88\" -DXS_VERSION=\"1.88\" -fPIC "-I/usr/lib/perl/5.18/CORE"   SSLeay.c
SSLeay.xs:163:25: fatal error: openssl/err.h: No such file or directory
 #include  openssl/err.h
                         ^
compilation terminated.
make: *** [SSLeay.o] Error 1

A successful solution

To HTTP::Tiny could work on the Protocol https need to install the library IO::Socket::SSL. To set IO::Socket::SSL need to install Net::SSLeay. But to install the library Net::SSLeay you need to put an additional library to the system.

On Ubuntu this is done with the command: 

$ apt-get update && apt-get install -y libssl-dev

After this you need to install IO::Socket::SSL: 

# cpanm IO::Socket::SSL

This command will successfully install the library Net::SSLeay and IO::Socket::SSL. And then HTTP::Tiny will be able to work on the Protocol https.

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