Hello, Daniel Stenberg and the curl team. I suggest today improve error message for become user friendly: ┌──(relun㉿relunsec)-[~/Test] └─$ curl 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 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 curl: (7) Could not connect to server ┌──(relun㉿relunsec)-[~/Test] └─$ improve it to ┌──(relun㉿relunsec)-[~/Test] └─$ curl -6 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 --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 --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 --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</title> <link href=" 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"; 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"; xmlns: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 <small> <pre class="version">0.9.2</pre> </small> </h2> <pre class="base-url">[ Base URL: httpbin.org/ ]</pre> </hgroup> <div class="description"> <div class="markdown"> <p>A simple HTTP Request & 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"; target="_blank">the developer - Website</a> </div> <a href="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";>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 --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</title> <link href=" 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"; 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"; xmlns: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 <small> <pre class="version">0.9.2</pre> </small> </h2> <pre class="base-url">[ Base URL: httpbin.org/ ]</pre> </hgroup> <div class="description"> <div class="markdown"> <p>A simple HTTP Request & 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"; target="_blank">the developer - Website</a> </div> <a href="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";>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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