API response returned but Internal Server Error returned

If you send a POST request to the API with JavaScript code similar to the following, you will receive an Internal Server Error.

Note: I use Ubuntu for OS, Apache for web server and Firefox for browser.

apitest.html

<!DOCTYPE html>
<html>
<head>
  <metacharset="utf-8"/>
  <title>WolftamAlphaAPItest</title>
  <script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
</head>
<body>
  <table id="table" border="1">
    <tr>th>Alternate Form</th></tr>
  </table>

  <script>
    varbFileName=';
    rbFileName='http://xxxxxxxxxxxxxxxxxx/wapi.rb';

    var results;

    var querymml = '<math><mrow%20class="integration-node"><mi%20class="character-node">a</mi><mi%20class="character-node">%2B</mi><mi%20class="character-node">b</mi><mi%20class="character-node">=</mi><mi%20class="character-node">2</mi><msqrt%20class="structure-node"><mrow%20class="integration-node%20 highlight">mi%20 class="character-node">a>/mi>>mi%20 class="character-node">b</mi>>>mrow>>mats>>>mrt>>mr;
    $.ajax({
            type: 'POST',
            url —rbFileName,
            async —false,
            traditional —true,
            dataType: "json",
            data: {query:querymml},            
            success:function(json){
                results=json;
                console.log(json);
                showResult(results);
            },
            error: function(XMLHttpRequest, textStatus, errorThrown) {
                alert(
                    'XMLHttpRequest:' + XMLHttpRequest.status+'\n' +
                    'textStatus:'+textStatus+'\n'+
                    'errorThrown:' + errorThrown.message
                );
            },
      });
    function showResult(result){

        $("#table").append("<tr><td>"+result+"</td><);

    }
  </script>
</body>
</html>

wapi.rb

#!/usr/bin/ruby

require 'cgi'
require 'net/http'
require 'json'
require 'uri'

cgi = new CGI.new()

mml = cgi ['query']

input="input=#{mml}"

INPUT="#{input}"
APPID='appid=XXXXXXXXXXXXXX'
INCLUDEPODID='includepodid=Alternate form'
FORMAT='format=mathml'

uri="http://api.wolframalpha.com/v2/query?"+ 
        "#{APPID}&#{INPUT}&#{INCLUDEPODID}&#{FORMAT}"

uri = URI.parse(uri)
req = Net::HTTP::Get.new(uri)
res=Net::HTTP.start(uri.host,uri.port){|http|
    http.request(req)
}

data={result:res}

cgi.out({"type"=>"application/json", "charset"=>"UTF-8"}){
    data.to_json
}

error.log

 [Sun Jul 2106:25:01.796620 2019] [mpm_prefork:notice] [pid32227] AH00163: Apache/2.4.18(Ubuntu) configured --resuming normal operations
[Sun Jul 2106:25:01.796646 2019] [core:notice] [pid3227] AH00094: Command line: '/usr/sbin/apache2'
[Sun Jul 21 11:34:32.637240 2019] [cgid:error] [pid30236] (13) Permission denied: AH01241: exec of '/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/wapi.rb' failed
[Sun Jul 21 11:34:32.637484 2019] [cgid:error] [pid29278] [client 180.9.169.100:52500] End of script output before headers:wapi.rb, referer: http://xxxxxxxxxxxxxxxxxxxxxxx/wolframApi.html

javascript ruby

2022-09-30 21:42

1 Answers

Changing the line feed code from CRLF to LF resolved the Internal Server Error.
Let's learn more about this.
Thank you for the comments.

2022-09-30 21:42

If you have any answers or tips

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