{"id":2827,"date":"2026-10-09T12:44:50","date_gmt":"2026-10-09T10:44:50","guid":{"rendered":"https:\/\/extendsclass.com\/blog\/?p=2827"},"modified":"2026-10-09T12:37:20","modified_gmt":"2026-10-09T10:37:20","slug":"building-privacy-friendly-apis-that-support-vpn-users","status":"publish","type":"post","link":"https:\/\/extendsclass.com\/blog\/building-privacy-friendly-apis-that-support-vpn-users","title":{"rendered":"Building privacy-friendly APIs that support VPN users"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">People are now adopting the use of VPN as a means of online protection. Developers ought to anticipate the requirements for VPN servers, shared addresses, or privacy-oriented browsers. The API should not require any information and should work.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Creating the Friends API involves gathering only the necessary data for the program, protecting sensitive information, and being cautious about IP addresses.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_47_1 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"ez-toc-toggle-icon-1\"><label for=\"item-6acf7defc88e9\" aria-label=\"Table of Content\"><span style=\"display: flex;align-items: center;width: 35px;height: 30px;justify-content: center;direction:ltr;\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/label><input  type=\"checkbox\" id=\"item-6acf7defc88e9\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/extendsclass.com\/blog\/building-privacy-friendly-apis-that-support-vpn-users\/#Understand_what_a_VPN_changes\" title=\"Understand what a VPN changes\">Understand what a VPN changes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/extendsclass.com\/blog\/building-privacy-friendly-apis-that-support-vpn-users\/#Collect_only_necessary_data\" title=\"Collect only necessary data\">Collect only necessary data<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/extendsclass.com\/blog\/building-privacy-friendly-apis-that-support-vpn-users\/#Authenticate_users_without_relying_on_IP\" title=\"Authenticate users without relying on IP\">Authenticate users without relying on IP<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/extendsclass.com\/blog\/building-privacy-friendly-apis-that-support-vpn-users\/#Keep_API_responses_minimal\" title=\"Keep API responses minimal\">Keep API responses minimal<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/extendsclass.com\/blog\/building-privacy-friendly-apis-that-support-vpn-users\/#Use_secure_HTTP_practices\" title=\"Use secure HTTP practices\">Use secure HTTP practices<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/extendsclass.com\/blog\/building-privacy-friendly-apis-that-support-vpn-users\/#Be_careful_with_logs\" title=\"Be careful with logs\">Be careful with logs<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/extendsclass.com\/blog\/building-privacy-friendly-apis-that-support-vpn-users\/#Test_VPN_scenarios_before_launch\" title=\"Test VPN scenarios before launch\">Test VPN scenarios before launch<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/extendsclass.com\/blog\/building-privacy-friendly-apis-that-support-vpn-users\/#Do_not_use_VPN_detection_as_a_shortcut\" title=\"Do not use VPN detection as a shortcut\">Do not use VPN detection as a shortcut<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/extendsclass.com\/blog\/building-privacy-friendly-apis-that-support-vpn-users\/#Protect_the_API_itself\" title=\"Protect the API itself\">Protect the API itself<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/extendsclass.com\/blog\/building-privacy-friendly-apis-that-support-vpn-users\/#Review_third-party_services\" title=\"Review third-party services\">Review third-party services<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/extendsclass.com\/blog\/building-privacy-friendly-apis-that-support-vpn-users\/#Make_privacy_part_of_API_testing\" title=\"Make privacy part of API testing\">Make privacy part of API testing<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/extendsclass.com\/blog\/building-privacy-friendly-apis-that-support-vpn-users\/#Conclusion\" title=\"Conclusion\">Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Understand_what_a_VPN_changes\"><\/span><strong>Understand what a VPN changes<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">VPN is able to substitute the IP with a VPN-linked address of a user. An API is therefore able to be shared between a vast number of people.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The name or physical whereabouts of the developers should not be part of the identity or physical location of the developers that is evidence of that identity or physical location. The IP data can be used to aid security and abuse prevention, but it has to be just one of the indicators.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Collect_only_necessary_data\"><\/span><strong>Collect only necessary data<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The simplest privacy enhancement is minimum data (minimalism). When you need to provide any field in a request or response in an API, you should do your best to know whether the field is really necessary in the application.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At least one of these may be an ID of an account that the API requires to retrieve a profile, but not an IP address, device model, browser version, and a specific location as the answer to a request. Irrelevant data is even more dangerous regarding acy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The <a href=\"https:\/\/www.nist.gov\/privacy-framework\">NIST Privacy Framework<\/a> assists organizations in locating, as well as dealing with, privacy risks, created by NIST.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Authenticate_users_without_relying_on_IP\"><\/span><strong>Authenticate users without relying on IP<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The use of IP-based authentication could be troublesome to users of VPN because some customers will seem to have similar addresses. A sounder design will be a secure design; it will utilize secure sessions, OAuth, or API keys, which are designed accordingly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Such IP information can be rated as limited or used to analyze abnormalities; however, developers should not prevent users who may be in a VPN range.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Among the <a href=\"https:\/\/api-security.owasp.org\/\">OWASP API Security Top 10<\/a> that are provided by OWASP, broken authentication, authorization, resource consumption, and security misconfiguration are identified.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Keep_API_responses_minimal\"><\/span><strong>Keep API responses minimal<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Information that is returned by an API also enjoys privacy. Do not send all the data fields back to the client since they may actually be performing some action with the database in the future. Returning properties will be restricted to only those that are needed in the running operation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This lessens the chances of accidental exposure, constrains sensitive data displayed on browser capabilities, logs, proxies, and hacked client systems.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Use_secure_HTTP_practices\"><\/span><strong>Use secure HTTP practices<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">All privacy-concerned API must be the ones that rely upon HTTPS to have their data to be safe over the air. Other areas that should be learned by the developers include HTTP headers, cookies, cross-origin policy, and caching.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The way the metadata is transported in request and response headers is defined in the <a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\">MDN Web Docs HTTP Documentation<\/a> on MDN. Establish these knowingly, not entirely relying on the default of some structure.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Be_careful_with_logs\"><\/span><strong>Be careful with logs<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">They can contain logs that prove helpful in debugging, but those can be a duplicate database of the user activity. The information that may be provided in the API outputs might include IP addresses, authorization name, request path, identifiers,r,s or error.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Create a logging plan that will involve the information on what is to be logged, retention, and the availability of the information. Passwords or access tokens should not be stored.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Test_VPN_scenarios_before_launch\"><\/span><strong>Test VPN scenarios before launch<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">An API may take different actions via the VPN infrastructure, which had been working well on a local connection when developing. Test writers, rate limiting, geolocation service, redirects, fraud control, and recovery of accounts under different network conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/extendsclass.com\/\">ExtendsClass<\/a> is easy to integrate into the same working processes,s as the developers are able to use the web-based tools to test the APIs and HTTP, query the database, and create some data. Fake data enables the teams to simulate scenarios without revealing data regarding customers.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Do_not_use_VPN_detection_as_a_shortcut\"><\/span><strong>Do not use VPN detection as a shortcut<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Other applications can automatically identify VPN content and decode it. Blanket blocking has the potential to cause accessibility and privacy issues.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Risk-based handling is a more appropriate solution. In case a request raises a multitude of red flags, perform further validation rather than make an assumption that the VPN is a bad element.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Protect_the_API_itself\"><\/span><strong>Protect the API itself<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The privacy-friendly features should enable the APIs not to allow a lot of information about the system to be known to the attackers. Secure information on the protected servers, stack traces, hostnames, database error messages, and debugging messages.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Check authorization, add checks, set reasonable rate limits, and delete idle endpoints. They are in place to safeguard user privacy and the API.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Review_third-party_services\"><\/span><strong>Review third-party services<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">An API can utilize analytics services, monitoring services, fraud theft services, geolocation services, or external APIs. Knowledge: Get to know what sort of data is leaving your infrastructure, and whether you need it, before sending it to a third party.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In this case, <a href=\"https:\/\/vpnpro.com\/\">VPNpro<\/a> can offer the developers (who are conducting research about receiving help on privacy) a second background on privacy over the internet in the case of the developers making studies about privacy aids and VPN technology. The lesson to be learned is only one and that is the need to ensure that privacy tools do not involve gathering data that is unnecessary.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Make_privacy_part_of_API_testing\"><\/span><strong>Make privacy part of API testing<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Privacy needs to be tested along with functionality and security. Test VPN requests, IP addresses, authentication errors, rate limits, logging, and unforeseen inputs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Any development workflow to which these checks are added is now expected to meet the new normal engineering requirement of privacy.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span><strong>Conclusion<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">No complex technology is demanded; rather, feasible design options must be taken to create privacy-friendly APIs to be used by users of VPN. Use IP addresses as limited attributes, authenticate people no matter where they are in the network, limit information gathered, ensure protection of API traffic, limit responses, and manage logging.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Above all practice APIs in a real privacy contextual situation. By using a combination of careful data processing, test tools, and the utilization of safe architecture, developers can create APIs that would not impede the privacy of VPN users.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>People are now adopting the use of VPN as a means of online protection. Developers ought to anticipate the requirements for VPN servers, shared addresses, or privacy-oriented browsers. The API should not require any information and should work. Creating the Friends API involves gathering only the necessary data for the program, protecting sensitive information, and [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1922,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","footnotes":""},"categories":[2],"tags":[],"class_list":["post-2827","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-development"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/extendsclass.com\/blog\/wp-json\/wp\/v2\/posts\/2827","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/extendsclass.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/extendsclass.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/extendsclass.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/extendsclass.com\/blog\/wp-json\/wp\/v2\/comments?post=2827"}],"version-history":[{"count":2,"href":"https:\/\/extendsclass.com\/blog\/wp-json\/wp\/v2\/posts\/2827\/revisions"}],"predecessor-version":[{"id":2829,"href":"https:\/\/extendsclass.com\/blog\/wp-json\/wp\/v2\/posts\/2827\/revisions\/2829"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/extendsclass.com\/blog\/wp-json\/wp\/v2\/media\/1922"}],"wp:attachment":[{"href":"https:\/\/extendsclass.com\/blog\/wp-json\/wp\/v2\/media?parent=2827"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/extendsclass.com\/blog\/wp-json\/wp\/v2\/categories?post=2827"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/extendsclass.com\/blog\/wp-json\/wp\/v2\/tags?post=2827"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}