如何在DBI-> connect的参数中使用空格？

我正在尝试使用DBI和连接SSL客户端密钥DBD::Pg.

use strict;
use warnings 'all';
use DBI;

my $dsn = "dbi:Pg:db=mydb;sslmode=require;host=localhost;"
    ."sslcert=C:\\path with\\spaces.crt;"
    ."sslkey=C:\\path with\\spaces.key";

my $dbh = DBI->connect( $dsn, 'username', '' );

我收到以下错误:

Can't connect to database: missing "=" after "with\spaces.crt" in connection info string!

我试过在值周围使用单引号或双引号无效,我在文档中找不到任何内容.

单引号如下:

my $dsn = "dbi:Pg:db=mydb;sslmode=require;host=localhost;"
    ."sslcert='C:\\path with\\spaces.crt';"
    ."sslkey='C:\\path with\\spaces.key'";

我收到以下错误:

failed: FATAL:  connection requires a valid client certificate

我知道这个配置有效,因为它适用于Python.

事实证明这是有效的:

my $dsn = "dbi:Pg:db=mydb;sslmode=require;host=localhost;"
    ."sslcert='C:\\\\path with\\\\spaces.crt';"
    ."sslkey='C:\\\\path with\\\\spaces.key'";

为什么我需要双逃逸反斜杠？