Hi "cyber security".

On 2025-08-15 (Fr.) 10:30, cyber security via curl-users wrote:
Hello, Daniel Stenberg and the curl team.

I suggest today improve error message for become user friendly:

Feel free to contribute ( https://github.com/curl/curl?tab=contributing-ov-file ) to the Project.

Regards
Aleks

  ┌──(relun㉿relunsec)-[~/Test]
└─$ curl https://127.0.0.0.1.1 <https://127.0.0.0.1.1>
curl: (6) Could not resolve host: 127.0.0.0.1.1

┌──(relun㉿relunsec)-[~/Test]
└─$

example provide a user friendly error message check first ip and next do dns resolution ┌──(relun㉿relunsec)-[~/Test]
└─$ curl https://127.0.0.0.1.1 <https://127.0.0.0.1.1>
curl: (6) Failed to parse the ip 127.0.0.0.1.1 excepted. must have 4 octets (e.g, 127.0.0.1).

┌──(relun㉿relunsec)-[~/Test]
└─$ also example
┌──(relun㉿relunsec)-[~/Test]
└─$ curl -6 http://127.0.0.1 <http://127.0.0.1>
curl: (7) Could not connect to server

┌──(relun㉿relunsec)-[~/Test]
└─$  improve it to ┌──(relun㉿relunsec)-[~/Test]
└─$ curl -6 http://127.0.0.1 <http://127.0.0.1>
curl: (7) This not valid IPv6. It seems ipv4 tries to remove -6.

┌──(relun㉿relunsec)-[~/Test]
└─$

here parse the IP is ipv4 and provide different error message examples like "curl: (7) This not valid IPv6. It seems ipv4 tries to remove -6." if not valid ipv6 or ipv4 fail to "curl: (7) Could not connect to server"

example also ┌──(relun㉿relunsec)-[~/Test]
└─$ curl https://httpbin.org <https://httpbin.org> --tls-max 1
curl: option --tls-max: is badly used here
curl: try 'curl --help' or 'curl --manual' for more information

┌──(relun㉿relunsec)-[~/Test]
└─$

improve it to ┌──(relun㉿relunsec)-[~/Test]
└─$ curl https://httpbin.org <https://httpbin.org> --tls-max 1
curl: option --tls-max: Invalid TLS Version choose from 1.0,1.1,1.2,1.3
curl: try 'curl --help' or 'curl --manual' for more information

┌──(relun㉿relunsec)-[~/Test]
└─$ here suggest valid TLS Version

and also same for └─$ curl https://httpbin.org <https://httpbin.org> --ftp-ssl- ccc-mode activea
Warning: unrecognized ftp CCC method 'activea', using default
<!DOCTYPE html>
<html lang="en">

<head>
     <meta charset="UTF-8">
     <title>httpbin.org <http://httpbin.org></title>
    <link href="https://fonts.googleapis.com/css?family=Open+Sans:400,700| Source+Code+Pro:300,600|Titillium+Web:400,600,700 <https://fonts.googleapis.com/ css?family=Open+Sans:400,700|Source+Code+Pro:300,600|Titillium+Web:400,600,700>"
         rel="stylesheet">
     <link rel="stylesheet" type="text/css" 
href="/flasgger_static/swagger-ui.css">
    <link rel="icon" type="image/png" href="/static/favicon.ico" sizes="64x64 32x32 16x16" />
     <style>
         html {
             box-sizing: border-box;
             overflow: -moz-scrollbars-vertical;
             overflow-y: scroll;
         }

         *,
         *:before,
         *:after {
             box-sizing: inherit;
         }

         body {
             margin: 0;
             background: #fafafa;
         }
     </style>
</head>

<body>
    <a href="https://github.com/requests/httpbin <https://github.com/requests/ httpbin>" class="github-corner" aria-label="View source on Github">         <svg width="80" height="80" viewBox="0 0 250 250" style="fill:#151513; color:#fff; position: absolute; top: 0; border: 0; right: 0;"
             aria-hidden="true">
             <path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path>
            <path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2"                 fill="currentColor" style="transform-origin: 130px 106px;" class="octo-arm"></path>             <path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z"
                 fill="currentColor" class="octo-body"></path>
         </svg>
     </a>
    <svg xmlns="http://www.w3.org/2000/svg <http://www.w3.org/2000/svg>" xmlns:xlink="http://www.w3.org/1999/xlink <http://www.w3.org/1999/xlink>" style="position:absolute;width:0;height:0">
         <defs>
             <symbol viewBox="0 0 20 20" id="unlocked">
                <path d="M15.8 8H14V5.6C14 2.703 12.665 1 10 1 7.334 1 6 2.703 6 5.6V6h2v-.801C8 3.754 8.797 3 10 3c1.203 0 2 .754 2 2.199V8H4c-.553 0-1 .646-1 1.199V17c0 .549.428 1.139.951 1.307l1.197.387C5.672 18.861 6.55 19 7.1 19h5.8c.549 0 1.428-.139 1.951-.307l1.196-.387c.524-.167.953-.757.953-1.306V9.199C17 8.646 16.352 8 15.8 8z"></path>
             </symbol>

             <symbol viewBox="0 0 20 20" id="locked">
                <path d="M15.8 8H14V5.6C14 2.703 12.665 1 10 1 7.334 1 6 2.703 6 5.6V8H4c-.553 0-1 .646-1 1.199V17c0 .549.428 1.139.951 1.307l1.197.387C5.672 18.861 6.55 19 7.1 19h5.8c.549 0 1.428-.139 1.951-.307l1.196-.387c.524-.167.953-.757.953-1.306V9.199C17 8.646 16.352 8 15.8 8zM12 8H8V5.199C8 3.754 8.797 3 10 3c1.203 0 2 .754 2 2.199V8z"
                 />
             </symbol>

             <symbol viewBox="0 0 20 20" id="close">
                <path d="M14.348 14.849c-.469.469-1.229.469-1.697 0L10 11.819l-2.651 3.029c-.469.469-1.229.469-1.697 0-.469-.469-.469-1.229 0-1.697l2.758-3.15-2.759-3.152c-.469-.469-.469-1.228 0-1.697.469-.469 1.228-.469 1.697 0L10 8.183l2.651-3.031c.469-.469 1.228-.469 1.697 0 .469.469.469 1.229 0 1.697l-2.758 3.152 2.758 3.15c.469.469.469 1.229 0 1.698z"
                 />
             </symbol>

             <symbol viewBox="0 0 20 20" id="large-arrow">
                <path d="M13.25 10L6.109 2.58c-.268-.27-.268-.707 0-.979.268-.27.701-.27.969 0l7.83 7.908c.268.271.268.709 0 .979l-7.83 7.908c-.268.271-.701.27-.969 0-.268-.269-.268-.707 0-.979L13.25 10z"
                 />
             </symbol>

             <symbol viewBox="0 0 20 20" id="large-arrow-down">
                <path d="M17.418 6.109c.272-.268.709-.268.979 0s.271.701 0 .969l-7.908 7.83c-.27.268-.707.268-.979 0l-7.908-7.83c-.27-.268-.27-.701 0-.969.271-.268.709-.268.979 0L10 13.25l7.418-7.141z"
                 />
             </symbol>


             <symbol viewBox="0 0 24 24" id="jump-to">
                <path d="M19 7v4H5.83l3.58-3.59L8 6l-6 6 6 6 1.41-1.41L5.83 13H21V7z" />
             </symbol>

             <symbol viewBox="0 0 24 24" id="expand">
                 <path d="M10 18h4v-2h-4v2zM3 6v2h18V6H3zm3 7h12v-2H6v2z" />
             </symbol>

         </defs>
     </svg>


     <div id="swagger-ui">
         <div data-reactroot="" class="swagger-ui">
             <div>
                 <div class="information-container wrapper">
                     <section class="block col-12">
                         <div class="info">
                             <hgroup class="main">
                                 <h2 class="title">httpbin.org 
<http://httpbin.org>
                                     <small>
                                         <pre class="version">0.9.2</pre>
                                     </small>
                                 </h2>
                                <pre class="base-url">[ Base URL: httpbin.org/ <http://httpbin.org/> ]</pre>
                             </hgroup>
                             <div class="description">
                                 <div class="markdown">
                                    <p>A simple HTTP Request &amp; Response Service.
                                         <br>
                                         <br>
                                         <b>Run locally: </b>
                                        <code>$ docker run -p 80:80 kennethreitz/httpbin</code>
                                     </p>
                                 </div>
                             </div>
                             <div>
                                 <div>
                                    <a href="https://kennethreitz.org <https:// kennethreitz.org>" target="_blank">the developer - Website</a>
                                 </div>
                                <a href="mailto:m...@kennethreitz.org <mailto:m...@kennethreitz.org>">Send email to the developer</a>
                             </div>
                         </div>
                         <!-- ADDS THE LOADER SPINNER -->
                         <div class="loading-container">
                             <div class="loading"></div>
                         </div>

                     </section>
                 </div>
             </div>
         </div>
     </div>


     <div class='swagger-ui'>
         <div class="wrapper">
             <section class="clear">
                 <span style="float: right;">
                     [Powered by
                    <a target="_blank" href="https://github.com/rochacbruno/ flasgger <https://github.com/rochacbruno/flasgger>">Flasgger</a>]
                     <br>
                 </span>
             </section>
         </div>
     </div>



     <script src="/flasgger_static/swagger-ui-bundle.js"> </script>
     <script src="/flasgger_static/swagger-ui-standalone-preset.js"> </script>
    <script src='/flasgger_static/lib/jquery.min.js' type='text/javascript'></ script>
     <script>

         window.onload = function () {


             fetch("/spec.json")
                 .then(function (response) {
                     response.json()
                         .then(function (json) {
                            var current_protocol = window.location.protocol.slice(0, -1);
                             if (json.schemes[0] != current_protocol) {
                                 // Switches scheme to the current in use
                                 var other_protocol = json.schemes[0];
                                 json.schemes[0] = current_protocol;
                                 json.schemes[1] = other_protocol;

                             }
                            json.host = window.location.host;  // sets the current host

                             const ui = SwaggerUIBundle({
                                 spec: json,
                                 validatorUrl: null,
                                 dom_id: '#swagger-ui',
                                 deepLinking: true,
                                 jsonEditor: true,
                                 docExpansion: "none",
                                 apisSorter: "alpha",
                                 //operationsSorter: "alpha",
                                 presets: [
                                     SwaggerUIBundle.presets.apis,
                                     // yay ES6 modules ↘
                                    Array.isArray(SwaggerUIStandalonePreset) ? SwaggerUIStandalonePreset : SwaggerUIStandalonePreset.default
                                 ],
                                 plugins: [
                                     SwaggerUIBundle.plugins.DownloadUrl
                                 ],

            // layout: "StandaloneLayout"  // uncomment to enable the green top header
         })

         window.ui = ui

         // uncomment to rename the top brand if layout is enabled
         // $(".topbar-wrapper .link span").replaceWith("<span>httpbin</span>");
         })
     })
}
     </script>  <div class='swagger-ui'>
     <div class="wrapper">
         <section class="block col-12 block-desktop col-12-desktop">
             <div>

                 <h2>Other Utilities</h2>

                 <ul>
                     <li>
                        <a href="/forms/post">HTML form</a> that posts to / post /forms/post</li>
                 </ul>

                 <br />
                 <br />
             </div>
         </section>
     </div>
</div>
</body>

</html>
┌──(relun㉿relunsec)-[~/Test]
└─$

improve it to └─$ curl https://httpbin.org <https://httpbin.org> --ftp-ssl-ccc- mode activea Warning: unrecognized ftp CCC method 'activea' choose from 'active' and 'passive', using default
<!DOCTYPE html>
<html lang="en">

<head>
     <meta charset="UTF-8">
     <title>httpbin.org <http://httpbin.org></title>
    <link href="https://fonts.googleapis.com/css?family=Open+Sans:400,700| Source+Code+Pro:300,600|Titillium+Web:400,600,700 <https://fonts.googleapis.com/ css?family=Open+Sans:400,700|Source+Code+Pro:300,600|Titillium+Web:400,600,700>"
         rel="stylesheet">
     <link rel="stylesheet" type="text/css" 
href="/flasgger_static/swagger-ui.css">
    <link rel="icon" type="image/png" href="/static/favicon.ico" sizes="64x64 32x32 16x16" />
     <style>
         html {
             box-sizing: border-box;
             overflow: -moz-scrollbars-vertical;
             overflow-y: scroll;
         }

         *,
         *:before,
         *:after {
             box-sizing: inherit;
         }

         body {
             margin: 0;
             background: #fafafa;
         }
     </style>
</head>

<body>
    <a href="https://github.com/requests/httpbin <https://github.com/requests/ httpbin>" class="github-corner" aria-label="View source on Github">         <svg width="80" height="80" viewBox="0 0 250 250" style="fill:#151513; color:#fff; position: absolute; top: 0; border: 0; right: 0;"
             aria-hidden="true">
             <path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path>
            <path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2"                 fill="currentColor" style="transform-origin: 130px 106px;" class="octo-arm"></path>             <path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z"
                 fill="currentColor" class="octo-body"></path>
         </svg>
     </a>
    <svg xmlns="http://www.w3.org/2000/svg <http://www.w3.org/2000/svg>" xmlns:xlink="http://www.w3.org/1999/xlink <http://www.w3.org/1999/xlink>" style="position:absolute;width:0;height:0">
         <defs>
             <symbol viewBox="0 0 20 20" id="unlocked">
                <path d="M15.8 8H14V5.6C14 2.703 12.665 1 10 1 7.334 1 6 2.703 6 5.6V6h2v-.801C8 3.754 8.797 3 10 3c1.203 0 2 .754 2 2.199V8H4c-.553 0-1 .646-1 1.199V17c0 .549.428 1.139.951 1.307l1.197.387C5.672 18.861 6.55 19 7.1 19h5.8c.549 0 1.428-.139 1.951-.307l1.196-.387c.524-.167.953-.757.953-1.306V9.199C17 8.646 16.352 8 15.8 8z"></path>
             </symbol>

             <symbol viewBox="0 0 20 20" id="locked">
                <path d="M15.8 8H14V5.6C14 2.703 12.665 1 10 1 7.334 1 6 2.703 6 5.6V8H4c-.553 0-1 .646-1 1.199V17c0 .549.428 1.139.951 1.307l1.197.387C5.672 18.861 6.55 19 7.1 19h5.8c.549 0 1.428-.139 1.951-.307l1.196-.387c.524-.167.953-.757.953-1.306V9.199C17 8.646 16.352 8 15.8 8zM12 8H8V5.199C8 3.754 8.797 3 10 3c1.203 0 2 .754 2 2.199V8z"
                 />
             </symbol>

             <symbol viewBox="0 0 20 20" id="close">
                <path d="M14.348 14.849c-.469.469-1.229.469-1.697 0L10 11.819l-2.651 3.029c-.469.469-1.229.469-1.697 0-.469-.469-.469-1.229 0-1.697l2.758-3.15-2.759-3.152c-.469-.469-.469-1.228 0-1.697.469-.469 1.228-.469 1.697 0L10 8.183l2.651-3.031c.469-.469 1.228-.469 1.697 0 .469.469.469 1.229 0 1.697l-2.758 3.152 2.758 3.15c.469.469.469 1.229 0 1.698z"
                 />
             </symbol>

             <symbol viewBox="0 0 20 20" id="large-arrow">
                <path d="M13.25 10L6.109 2.58c-.268-.27-.268-.707 0-.979.268-.27.701-.27.969 0l7.83 7.908c.268.271.268.709 0 .979l-7.83 7.908c-.268.271-.701.27-.969 0-.268-.269-.268-.707 0-.979L13.25 10z"
                 />
             </symbol>

             <symbol viewBox="0 0 20 20" id="large-arrow-down">
                <path d="M17.418 6.109c.272-.268.709-.268.979 0s.271.701 0 .969l-7.908 7.83c-.27.268-.707.268-.979 0l-7.908-7.83c-.27-.268-.27-.701 0-.969.271-.268.709-.268.979 0L10 13.25l7.418-7.141z"
                 />
             </symbol>


             <symbol viewBox="0 0 24 24" id="jump-to">
                <path d="M19 7v4H5.83l3.58-3.59L8 6l-6 6 6 6 1.41-1.41L5.83 13H21V7z" />
             </symbol>

             <symbol viewBox="0 0 24 24" id="expand">
                 <path d="M10 18h4v-2h-4v2zM3 6v2h18V6H3zm3 7h12v-2H6v2z" />
             </symbol>

         </defs>
     </svg>


     <div id="swagger-ui">
         <div data-reactroot="" class="swagger-ui">
             <div>
                 <div class="information-container wrapper">
                     <section class="block col-12">
                         <div class="info">
                             <hgroup class="main">
                                 <h2 class="title">httpbin.org 
<http://httpbin.org>
                                     <small>
                                         <pre class="version">0.9.2</pre>
                                     </small>
                                 </h2>
                                <pre class="base-url">[ Base URL: httpbin.org/ <http://httpbin.org/> ]</pre>
                             </hgroup>
                             <div class="description">
                                 <div class="markdown">
                                    <p>A simple HTTP Request &amp; Response Service.
                                         <br>
                                         <br>
                                         <b>Run locally: </b>
                                        <code>$ docker run -p 80:80 kennethreitz/httpbin</code>
                                     </p>
                                 </div>
                             </div>
                             <div>
                                 <div>
                                    <a href="https://kennethreitz.org <https:// kennethreitz.org>" target="_blank">the developer - Website</a>
                                 </div>
                                <a href="mailto:m...@kennethreitz.org <mailto:m...@kennethreitz.org>">Send email to the developer</a>
                             </div>
                         </div>
                         <!-- ADDS THE LOADER SPINNER -->
                         <div class="loading-container">
                             <div class="loading"></div>
                         </div>

                     </section>
                 </div>
             </div>
         </div>
     </div>


     <div class='swagger-ui'>
         <div class="wrapper">
             <section class="clear">
                 <span style="float: right;">
                     [Powered by
                    <a target="_blank" href="https://github.com/rochacbruno/ flasgger <https://github.com/rochacbruno/flasgger>">Flasgger</a>]
                     <br>
                 </span>
             </section>
         </div>
     </div>



     <script src="/flasgger_static/swagger-ui-bundle.js"> </script>
     <script src="/flasgger_static/swagger-ui-standalone-preset.js"> </script>
    <script src='/flasgger_static/lib/jquery.min.js' type='text/javascript'></ script>
     <script>

         window.onload = function () {


             fetch("/spec.json")
                 .then(function (response) {
                     response.json()
                         .then(function (json) {
                            var current_protocol = window.location.protocol.slice(0, -1);
                             if (json.schemes[0] != current_protocol) {
                                 // Switches scheme to the current in use
                                 var other_protocol = json.schemes[0];
                                 json.schemes[0] = current_protocol;
                                 json.schemes[1] = other_protocol;

                             }
                            json.host = window.location.host;  // sets the current host

                             const ui = SwaggerUIBundle({
                                 spec: json,
                                 validatorUrl: null,
                                 dom_id: '#swagger-ui',
                                 deepLinking: true,
                                 jsonEditor: true,
                                 docExpansion: "none",
                                 apisSorter: "alpha",
                                 //operationsSorter: "alpha",
                                 presets: [
                                     SwaggerUIBundle.presets.apis,
                                     // yay ES6 modules ↘
                                    Array.isArray(SwaggerUIStandalonePreset) ? SwaggerUIStandalonePreset : SwaggerUIStandalonePreset.default
                                 ],
                                 plugins: [
                                     SwaggerUIBundle.plugins.DownloadUrl
                                 ],

            // layout: "StandaloneLayout"  // uncomment to enable the green top header
         })

         window.ui = ui

         // uncomment to rename the top brand if layout is enabled
         // $(".topbar-wrapper .link span").replaceWith("<span>httpbin</span>");
         })
     })
}
     </script>  <div class='swagger-ui'>
     <div class="wrapper">
         <section class="block col-12 block-desktop col-12-desktop">
             <div>

                 <h2>Other Utilities</h2>

                 <ul>
                     <li>
                        <a href="/forms/post">HTML form</a> that posts to / post /forms/post</li>
                 </ul>

                 <br />
                 <br />
             </div>
         </section>
     </div>
</div>
</body>

</html>
┌──(relun㉿relunsec)-[~/Test]
└─$

and also you can improve other error messages you can adjust if you would.

Dear

RelunSec





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