[EP-tech] Sending out Error Statuses with Error codes

Adam Field adam at adamfield.net
Tue Jun 26 17:00:40 BST 2018



                I’m working on an API that spits out objects in JSON, and I have a function that handles errors.  I can’t seem to get it to behave, and I wonder if anyone can offer me any advice.


sub api_error


        my ($repo, $code, $message) = @_;


        my $r = $repo->request;



        EPrints::Apache::AnApache::send_status_line( $r, $code );



        my $json = JSON->new;

        my $content = $json->encode(


                status => $code,

                message => $message




        $r->err_headers_out->{'Content-Length'} = length $content;


#       binmode(STDOUT, ":utf8");

#       print $content;


        return $code;



Using CURL to look at the headers and body, I get this:


HTTP/1.1 400 Bad Request

Date: Tue, 26 Jun 2018 15:48:51 GMT

Server: Apache/2.4.7 (Ubuntu)

Content-Length: 120

Connection: close

Content-Type: text/html; charset=iso-8859-1





<title>400 Bad Request</title>


<h1>Bad Request</h1>

<p>Your browser sent a request that this server could not understand.<br />



<address>Apache/2.4.7 (Ubuntu) Server at sherpaneo-test.sherpa.ac.uk Port 443</address>



If I uncomment the two commented lines, I get this:


HTTP/1.1 200 OK

Date: Tue, 26 Jun 2018 15:48:36 GMT

Server: Apache/2.4.7 (Ubuntu)

Content-Length: 120

Content-Type: application/json



{"message":"unrecognised api key in 'api-key' at /usr/share/eprints3/lib/plugins/SherpaAPI.pm line 470.\n","status":400}



Essentially, if I output anything to STDOUT, something (maybe MOD Perl) switches the status to ‘200 OK’.  How can I get the status code from the first version, and the body from the second?  Any ideas?






Adam Field

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