Re: CGI: newlines, write exactly "\r\n" to end the headers, then turn off binmode

what server? What version cgi.pm? You can create cgi objects without it reading fom stdin.

I'm experimenting with an Erlang inets httpd server. If you install Erlang, I can give you the code to start a server.
~$ perl -MCGI -e 'print "$CGI::VERSION\n";' => 4.38

You can create cgi objects without it reading fom stdin.

When I create a cgi object after reading from STDIN, my curl request to my Erlang server for the cgi script hangs, then times out (but it does succeed on my apache server):

#!/usr/bin/env perl

use strict;
use warnings;
use 5.020;
use autodie;
use Data::Dumper;

use JSON;
use CGI; 
use CGI::Carp qw(fatalsToBrowser);


if (my $content_len = $ENV{CONTENT_LENGTH}) {

    read(STDIN, my $json, $content_len);
    my $href = decode_json($json);
    my $a = $href->{a};
    my $b = $href->{b};

    my $q = CGI->new; #Doesn't work with inets httpd server

    print $q->header,
          $q->start_html("Test Page"),
          $q->div("json=$json"),
          $q->div("a=$a"),
          $q->div("b=$b"),
          $q->end_html;

    #print 'Content-type: text/html';
    #print  "\r\n\r\n";
    #print  "<div>a=$a</div>";
    #print  "<div>b=$b</div>";

} 
else {
    my $error = "Could not read json: No Content-Length header in requ
+est.";
    #print 'Content-type: text/html';
    #print "\r\n\r\n";
    #print "<div>$error</div>";

    my $q = CGI->new;
    print $q->header,
          $q->start_html("Test Page"),
          $q->h1($error),
          $q->end_html;
}
[download]

If I comment out the $q lines and uncomment the other print statements, then my curl request succeeds.

Failed curl request:

~$ curl -v -H 'Content-Type: application/json' --data '{"a": 1, "b": 2
+}' http://localhost:65451/cgi-bin/1.pl
*   Trying ::1...
* TCP_NODELAY set
* Connection failed
* connect to ::1 port 65451 failed: Connection refused
*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to localhost (127.0.0.1) port 65451 (#0)
> POST /cgi-bin/1.pl HTTP/1.1
> Host: localhost:65451
> User-Agent: curl/7.58.0
> Accept: */*
> Content-Type: application/json
> Content-Length: 16
> 
* upload completely sent off: 16 out of 16 bytes

==== Hangs here for about 5 sseconds =======

< HTTP/1.1 504 Gateway Time-out
< Date: Fri, 09 Mar 2018 14:40:55 GMT
< Content-Type: text/html
< Server: inets/6.4.5
* no chunk, no close, no size. Assume close to signal end
< 
* Closing connection 0
~$
[download]

Succesful curl request:

~$ curl -v -H 'Content-Type: application/json' --data '{"a": 1, "b": 2
+}' http://localhost:65451/cgi-bin/1.pl
*   Trying ::1...
* TCP_NODELAY set
* Connection failed
* connect to ::1 port 65451 failed: Connection refused
*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to localhost (127.0.0.1) port 65451 (#0)
> POST /cgi-bin/1.pl HTTP/1.1
> Host: localhost:65451
> User-Agent: curl/7.58.0
> Accept: */*
> Content-Type: application/json
> Content-Length: 16
> 
* upload completely sent off: 16 out of 16 bytes
< HTTP/1.1 200 OK
< Date: Fri, 09 Mar 2018 14:52:03 GMT
< Server: inets/6.4.5
< Transfer-Encoding: chunked
< Content-Type: text/html
< 
* Connection #0 to host localhost left intact
<div>a=1</div><div>b=2</div>~$ 
</div>
[download]

Comment on Re: CGI: newlines, write exactly "\r\n" to end the headers, then turn off binmode Select or Download Code

Replies are listed 'Best First'.
Re^2: CGI: newlines, write exactly "\r\n" to end the headers, then turn off binmode by Anonymous Monk on Mar 10, 2018 at 08:01 UTC
Hi, $cgi->{POSTDATA} gives me inconsistent results depending on my server Hmm, that isn't exactly how you spell `$cgi->param('POSTDATA')` I'm sure both CGI.pm maintainer and erlang inets maintainers would be grateful for code that demonstrates these bugs , so they can fix them. I'm experimenting with an Erlang inets httpd server. If you install Erlang, I can give you the code to start a server. What version of erlang inets ? Surely even erlang inets httpd server have version numbers :) When I create a cgi object after reading from STDIN, my curl request to my Erlang server for the cgi script hangs, then times out (but it does succeed on my apache server): I'm fairly certain thats the version that tries to read from STDIN. So I would suggest checking CGI.pm docs for ->new and use the version of the call that doesn't try to read from STDIN 1210567 In reply to 1210553 Why are you replying to your own nodes instead of hitting "reply" to the node you're quoting? Threaded discussion is threaded.	[reply] [d/l]
Re^3: CGI: newlines, write exactly "\r\n" to end the headers, then turn off binmode by 7stud (Deacon) on Mar 10, 2018 at 11:41 UTC
Hmm, that isn't exactly how you spell $cgi->param('POSTDATA') Sorry about that. I checked my code and it's spelled correctly in my code. What version of erlang inets ? Surely even erlang inets httpd server have version numbers :) It's actually in the curl output I posted: `* upload completely sent off: 16 out of 16 bytes < HTTP/1.1 200 OK < Date: Fri, 09 Mar 2018 14:52:03 GMT < Server: inets/6.4.5` [download] I'm using erlang 20.2, so I assume inets 6.4.5 is the most recent version. Thanks for taking a look. I'm fairly certain thats the version that tries to read from STDIN. So I would suggest checking CGI.pm docs for ->new and use the version of the call that doesn't try to read from STDIN Yep, `my$q->CGI-new('')` allows me to use the CGI functions after I manually read from STDIN.	[reply] [d/l] [select]

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