{"id":37613,"date":"2025-11-25T11:47:42","date_gmt":"2025-11-25T11:47:42","guid":{"rendered":"https:\/\/www.hostingseekers.com\/blog\/?p=37613"},"modified":"2025-11-25T12:09:10","modified_gmt":"2025-11-25T12:09:10","slug":"azure-error-405-fix","status":"publish","type":"post","link":"https:\/\/www.hostingseekers.com\/blog\/azure-error-405-fix\/","title":{"rendered":"Azure Error 405 When Accessing API? Here\u2019s How to Fix It Fast"},"content":{"rendered":"<p>Azure Error 405 is a common and confusing issue that developers encounter when calling APIs in Azure. It occurs when the server recognizes your request but blocks it because the HTTP method (GET, POST, PUT, DELETE, etc.) is not permitted for that endpoint. The tricky part is that everything else, like your URL, deployment, or API tests in Postman, may look perfectly fine. Yet the same request fails in production, on the frontend, or inside APIM.<\/p>\n<p>This blog breaks down what causes Azure Error 405 across services like Azure Functions, APIM, App Services, and Static Web Apps, and shows you exactly how to fix it quickly.<\/p>\n<h2 aria-level=\"2\"><b><span data-contrast=\"auto\">What Is Azure Error 405?<\/span><\/b><\/h2>\n<p>Azure Error 405 means \u201cMethod Not Allowed.\u201d When Azure returns this code:<\/p>\n<ul>\n<li>The server correctly understands your HTTP request (valid URL, headers, body, etc.).<\/li>\n<li>The API endpoint exists (not a 404).<\/li>\n<li>But the HTTP method (GET\/POST\/PUT\/DELETE) is not permitted for that endpoint.<\/li>\n<\/ul>\n<p><strong>Key Debugging Tip:<\/strong> Every 405 response includes an Allow header showing which HTTP methods actually work.<\/p>\n<p><strong>Example:<\/strong><\/p>\n<div class=\"copy-wrapper\">\n<h5 class=\"copy-tag\">text<br \/>\nHTTP\/1.1 405 Method Not Allowed<br \/>\nAllow: GET, POST, OPTIONS<br \/>\nContent-Type: application\/json{ &#8220;error&#8221;: &#8220;Method not allowed&#8221;, &#8220;message&#8221;: &#8220;This API endpoint only supports GET and POST requests&#8221; }<\/h5>\n<p><button class=\"copyButton\"><i class=\"fa-solid fa-copy\"><\/i><\/button><br \/>\n<span class=\"copy-message\">Copied!<\/span><\/p>\n<\/div>\n<h2 aria-level=\"2\"><b><span data-contrast=\"auto\">How 405 Differs from Other API Errors<\/span><\/b><\/h2>\n<p><span data-contrast=\"auto\">Developers often confuse 405 with other HTTP status codes.\u00a0Here&#8217;s\u00a0how to distinguish them:<\/span><\/p>\n<table data-tablestyle=\"MsoNormalTable\" data-tablelook=\"1696\" aria-rowcount=\"7\">\n<tbody>\n<tr aria-rowindex=\"1\">\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">HTTP Code<\/span><\/b><\/td>\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">Meaning<\/span><\/b><\/td>\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">API Example<\/span><\/b><\/td>\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">Fix<\/span><\/b><\/td>\n<\/tr>\n<tr aria-rowindex=\"2\">\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">400\u00a0<\/span><\/b><\/td>\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">Bad Request<\/span><\/b><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Sending invalid JSON body to POST \/api\/products<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Check request format,\u00a0validate\u00a0JSON syntax<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"3\">\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">401\u00a0<\/span><\/b><\/td>\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">Unauthorized<\/span><\/b><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">No API key in header for POST \/api\/products<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Add a valid authentication token\/API key<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"4\">\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">403\u00a0<\/span><\/b><\/td>\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">Forbidden<\/span><\/b><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Valid token but no access to resource<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Request elevated permissions or a different API key<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"5\">\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">404\u00a0<\/span><\/b><\/td>\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">Not Found<\/span><\/b><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Requesting \/api\/wrong path\u00a0that\u00a0doesn&#8217;t\u00a0exist<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Check the correct API endpoint URL<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"6\">\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">405\u00a0<\/span><\/b><\/td>\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">Method Not Allowed<\/span><\/b><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Sending DELETE to \/api\/products (GET\/POST only)<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Use the correct HTTP method (GET instead of DELETE)<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"7\">\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">500\u00a0<\/span><\/b><\/td>\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">Internal Server Error<\/span><\/b><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Unhandled exception in backend code<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Check server logs, fix backend error<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Real Error Messages<\/h3>\n<h4><strong>IIS \/ App Service:<\/strong><\/h4>\n<p>HTTP Error 405.0 &#8211; Method Not Allowed: The resource does not support the specified HTTP verb.<\/p>\n<h4><strong>APIM:<\/strong><\/h4>\n<p>\u201cMethod not allowed.\u201d Or, incorrectly, \u201c404 Not Found\u201d when the operation isn\u2019t defined.<\/p>\n<h4>Functions:<\/h4>\n<p>JSON response showing status 405 and allowed methods.<\/p>\n<h4>Browser\/Front-end:<\/h4>\n<p>\u201cAccess blocked by CORS policy: Response to preflight request had HTTP status code 405.\u201d<\/p>\n<h3>Common Causes (By Platform)<\/h3>\n<h3>1. Wrong HTTP Method<\/h3>\n<p>Sending a method not defined for the endpoint (e.g., trying DELETE where only GET\/POST is allowed).<\/p>\n<h4>Fix:<\/h4>\n<p>Check docs\/OpenAPI for allowed methods.<\/p>\n<p>Use curl:<\/p>\n<div class=\"copy-wrapper\">\n<h5 class=\"copy-tag\">text curl -i -X DELETE https:\/\/api.azurewebsites.net\/api\/products\/123<\/h5>\n<p><button class=\"copyButton\"><i class=\"fa-solid fa-copy\"><\/i><\/button><br \/>\n<span class=\"copy-message\">Copied!<\/span><\/p>\n<\/div>\n<p>If Allow: GET, POST is returned, DELETE will not work.<\/p>\n<h3>2. StaticFile Handler Conflicts (App Service\/IIS)<\/h3>\n<p>Routes with .html or other static file extensions get handled by StaticFile, which only supports GET\/HEAD. Non-GET verbs fail with 405.<\/p>\n<h4>Fix:<\/h4>\n<p>Use \/api\/* routes for APIs and make sure web.config handlers separate static files from APIs:<\/p>\n<p><span data-contrast=\"auto\">xml<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">&lt;system.webServer&gt;<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">\u00a0&lt;handlers&gt;<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">\u00a0&lt;add name=&#8221;StaticFile&#8221; path=&#8221;*.html&#8221; verb=&#8221;GET,HEAD&#8221; \/&gt;<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">\u00a0&lt;add name=&#8221;aspNetCore&#8221; path=&#8221;\/api\/*&#8221; verb=&#8221; GET, POST, PUT, DELETE, OPTIONS&#8221; \/&gt;<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">\u00a0&lt;\/handlers&gt;<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">&lt;\/system.webServer&gt;<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<h3>3. WebDAV Publishing Interference<\/h3>\n<p>WebDAV (enabled by default on some IIS servers) can block PUT\/DELETE, causing 405.<\/p>\n<h4>Fix:<\/h4>\n<p>Remove WebDAV from web.config:<\/p>\n<p><span data-contrast=\"auto\">xml<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">&lt;modules&gt;<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">\u00a0&lt;remove name=&#8221;WebDAVModule&#8221; \/&gt;<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">&lt;\/modules&gt;<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">&lt;handlers&gt;<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">\u00a0&lt;remove name=&#8221;WebDAV&#8221; \/&gt;<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">&lt;\/handlers&gt;<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<h3>4. CORS Preflight (OPTIONS) Request Failure<\/h3>\n<p>Browser-based API calls send a preflight OPTIONS request before POST\/PUT\/DELETE. If OPTIONS isn\u2019t handled, you\u2019ll see a 405 (and browser blocks the actual request).<\/p>\n<h4>Fix:<\/h4>\n<p>For Functions, include &#8220;options&#8221; in function.json:<\/p>\n<div class=\"copy-wrapper\">\n<h5 class=\"copy-tag\">json<br \/>\n&#8220;methods&#8221;: [&#8220;get&#8221;, &#8220;post&#8221;, &#8220;options&#8221;]<br \/>\nRespond to OPTIONS in your backend code, e.g., Node.js:<br \/>\njs<br \/>\nif (req.method === &#8220;OPTIONS&#8221;) {<\/p>\n<p>res.status(200).set({<\/p>\n<p>&#8216;Access-Control-Allow-Origin&#8217;: &#8216;*&#8217;,<\/p>\n<p>&#8216;Access-Control-Allow-Methods&#8217;: &#8216;GET, POST, OPTIONS&#8217;,<\/p>\n<p>&#8216;Access-Control-Allow-Headers&#8217;: &#8216;Content-Type, Authorization&#8217;,<\/p>\n<p>&#8216;Allow&#8217;: &#8216;GET, POST, OPTIONS&#8217;<\/p>\n<p>}).end();<\/p>\n<p>}<\/h5>\n<p><button class=\"copyButton\"><i class=\"fa-solid fa-copy\"><\/i><\/button><br \/>\n<span class=\"copy-message\">Copied!<\/span><\/p>\n<\/div>\n<h3>5. Azure Functions function.json Method Declaration<\/h3>\n<p>If your method isn\u2019t in the &#8220;methods&#8221; array of function.json (MUST BE LOWERCASE), Azure returns 405 even if your code handles it.<\/p>\n<h4>Fix:<\/h4>\n<div class=\"copy-wrapper\">\n<h5 class=\"copy-tag\">json<br \/>\n&#8220;methods&#8221;: [&#8220;get&#8221;, &#8220;post&#8221;, &#8220;put&#8221;, &#8220;delete&#8221;, &#8220;options&#8221;]<\/h5>\n<p><button class=\"copyButton\"><i class=\"fa-solid fa-copy\"><\/i><\/button><br \/>\n<span class=\"copy-message\">Copied!<\/span><\/p>\n<\/div>\n<h3>6. APIM Operation Not Defined<\/h3>\n<p>By default, APIM will return 404 for a missing HTTP method unless you override with a 405-response policy.<\/p>\n<h4><strong>Fix:<\/strong><\/h4>\n<p>Define the operation (DELETE, PUT, etc.) in APIM design.<\/p>\n<p>Or use the APIM return-response policy:<\/p>\n<p><span data-contrast=\"auto\">xml<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">&lt;choose&gt;<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">\u00a0&lt;when\u00a0<\/span><span data-contrast=\"none\">condition=&#8221;@(context.LastError.Source<\/span><span data-contrast=\"auto\">\u00a0== &#8216;configuration&#8217; &amp;&amp;\u00a0context.LastError.Reason\u00a0== &#8216;OperationNotFound&#8217;)&#8221;&gt;<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">\u00a0&lt;return-response&gt;<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">\u00a0&lt;set-status code=&#8221;405&#8243; reason=&#8221;Method not allowed&#8221; \/&gt;<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">\u00a0&lt;set-body&gt;<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">\u00a0{ &#8220;status&#8221;: &#8220;HTTP 405&#8221;, &#8220;message&#8221;: &#8220;Method not allowed&#8221; }<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">\u00a0&lt;\/set-body&gt;<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">\u00a0&lt;\/return-response&gt;<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">\u00a0&lt;\/when&gt;<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">&lt;\/choose&gt;<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<h3>7. Missing CORS Headers or Configuration<\/h3>\n<p>Frontend browser calls require allowed origins and methods in CORS headers. Otherwise, even allowed requests are blocked as \u201cfailed options.\u201d<\/p>\n<h4>Fix:<\/h4>\n<p>Add headers for CORS:<\/p>\n<p><span data-contrast=\"auto\">xml<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">&lt;add name=&#8221;Access-Control-Allow-Origin&#8221; value=&#8221;*&#8221; \/&gt;<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">&lt;add name=&#8221;Access-Control-Allow-Methods&#8221; value=&#8221;GET, POST, PUT, DELETE, OPTIONS&#8221; \/&gt;<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">&lt;add name=&#8221;Access-Control-Allow-Headers&#8221; value=&#8221;Content-Type, Authorization&#8221; \/&gt;<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">&lt;add name=&#8221;Allow&#8221; value=&#8221;GET, POST, PUT, DELETE, OPTIONS&#8221; \/&gt;<\/span><\/p>\n<h2>How to Fix Azure Error 405?<\/h2>\n<h3>1. For API Management (APIM)<\/h3>\n<h5>1. Check Inbound\/Outbound Methods:<\/h5>\n<p>Every API operation must allow the required methods. Update OpenAPI\/Swagger definitions as needed.<\/p>\n<h5>2. Review Policy Overriding:<\/h5>\n<p>Check inbound policies (especially ).<\/p>\n<h5>3. Implement Error Response Policy:<\/h5>\n<p>Use and to force 405 on missing methods (see code above).<\/p>\n<h5>4. Validate API Version:<\/h5>\n<p>Make sure you are testing against the right API version and endpoint.<\/p>\n<h3>2. For Azure Function Apps<\/h3>\n<h5>1. Add Allowed Methods:<\/h5>\n<p>Make sure &#8220;methods&#8221; in function.json includes every needed verb, all lowercase.<\/p>\n<h5>2. Check Authorization Keys:<\/h5>\n<p>Pass the required function or host keys properly.<\/p>\n<h5>3. Fix Route Templates:<\/h5>\n<p>Route\/template in function.json must match what the API expects.<\/p>\n<h3>3. For Azure App Service ( .NET\/Node\/Python)<\/h3>\n<h5>1. Validate Routing:<\/h5>\n<p>Use [HttpGet], [HttpPost], etc. on controller methods; double-check templates.<\/p>\n<h5>2. Fix the web.config Conflicts:<\/h5>\n<p>Remove unneeded WebDAV\/module\/handler entries; don\u2019t block required methods.<\/p>\n<h5>3. Add OPTIONS Support:<\/h5>\n<p>.NET Web API might require an explicit [HttpOptions] action; Node.js\/Express needs .options() endpoint.<\/p>\n<h3>4. For Browser-based (Front-end) Calls<\/h3>\n<h5>1. Enable OPTIONS:<\/h5>\n<p>Backend must return 200 for OPTIONS with proper CORS headers.<\/p>\n<h5>2. Check HTTPS Redirection:<\/h5>\n<p>Make sure <a href=\"https:\/\/www.hostingseekers.com\/blog\/how-to-redirect-http-to-https-using-htaccess\/\">HTTP-to-HTTPS<\/a> redirects don\u2019t mistakenly block POST\/DELETE requests.<\/p>\n<h5>3. Configure CORS:<\/h5>\n<p>Azure must allow your frontend origin and headers\/methods in the CORS config.<\/p>\n<h2>Troubleshooting Table<\/h2>\n<table style=\"font-weight: 400;\" data-tablestyle=\"MsoNormalTable\" data-tablelook=\"1696\" aria-rowcount=\"8\">\n<tbody>\n<tr aria-rowindex=\"1\">\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">Cause<\/span><\/b><\/td>\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">Symptom<\/span><\/b><\/td>\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">Root Check<\/span><\/b><\/td>\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">Fix<\/span><\/b><\/td>\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">Prevention<\/span><\/b><\/td>\n<\/tr>\n<tr aria-rowindex=\"2\">\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">Wrong HTTP method<\/span><\/b><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">405 on correct endpoint; Allow header shows different methods<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Compare your method vs API docs<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Use the correct method matching specification<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Document all API methods;\u00a0validate\u00a0requests<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"3\">\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">function.json\u00a0missing method<\/span><\/b><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">405 only in Azure Functions; works locally<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Check\u00a0<\/span><span data-contrast=\"auto\">&#8220;methods&#8221;<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Add method to array (must be lowercase); redeploy<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Use templates; always test post-deployment<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"4\">\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">Missing OPTIONS for CORS<\/span><\/b><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">405 on OPTIONS request; browser blocks actual request<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Test OPTIONS separately; check preflight in the Network tab<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Add &#8220;options&#8221; to methods; handle OPTIONS in code<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Always add OPTIONS; test cross-origin calls<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"5\">\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">WebDAV module enabled<\/span><\/b><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">405 on PUT\/DELETE; error shows\u00a0WebDAVModule<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Check the error message for the WebDAVModule reference<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Remove WebDAV from\u00a0web.config<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Disable WebDAV in fresh deployments<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"6\">\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">APIM operation not defined<\/span><\/b><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">405 when via APIM, but works directly<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Check the APIM Design tab for operation<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Add operation definition in APIM<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Document APIM operations; test via gateway<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"7\">\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">StaticFile\u00a0handler conflict<\/span><\/b><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">405 on POST to static assets<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Check handlers in\u00a0web.config<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Route APIs through different handlers<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Separate API routes from static files<\/span><\/td>\n<\/tr>\n<tr aria-rowindex=\"8\">\n<td data-celllook=\"4369\"><b><span data-contrast=\"auto\">Missing CORS headers<\/span><\/b><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">CORS error in browser; works in Postman<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Test in browser; check Network tab for preflight<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Add Access-Control-Allow-* headers<\/span><\/td>\n<td data-celllook=\"4369\"><span data-contrast=\"auto\">Always include CORS headers in responses<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>When to Contact Azure Support?<\/h2>\n<p>Most Azure Error 405 issues can be resolved by following the steps outlined in this guide. However, consider contacting Azure Support when:<\/p>\n<ul>\n<li>You have thoroughly checked API configurations, function.json, APIM policies, and CORS setups, but the 405 error persists.<\/li>\n<li>Your API works locally or in staging but fails in production, suggesting possible platform or deployment inconsistencies.<\/li>\n<li>You encounter complex scenarios like multi-region API Management, advanced custom policies, or network configurations, causing inconsistent HTTP method handling.<\/li>\n<li>There are ongoing Azure service outages or incidents affecting your APIs.<\/li>\n<li>The 405 error causes urgent production impact, and internal troubleshooting has been exhausted.<\/li>\n<\/ul>\n<p><strong>Before contacting support, gather:<\/strong> APIM trace logs, function.json files, curl\/Postman request and response details, environment info, and a clear description of your troubleshooting steps. These help support the diagnosis and resolution of your issue swiftly.<\/p>\n<h2>Conclusion<\/h2>\n<p>Azure Error 405 When Accessing APIs occurs when you use an HTTP method that the API endpoint doesn&#8217;t support. Whether caused by Microsoft&#8217;s 3 documented causes (wrong method, StaticFile handler, WebDAV) or Azure-specific issues (APIM operations, CORS preflight, function.json), the fix is systematic.<\/p>\n<h2>Frequently Asked Questions<\/h2>\n<h4>Q1. What does Azure Error 405 mean?<\/h4>\n<p><strong>Ans.<\/strong> Azure Error 405 means the endpoint is valid, but the HTTP method you used (e.g., POST, DELETE) is not allowed. Check the Allow header for what works.<\/p>\n<h4>Q2. Why does my API return 405 even though it works in Postman?<\/h4>\n<p><strong>Ans.<\/strong> Most often, Postman sends direct requests and does not trigger browser CORS preflight (OPTIONS); your frontend may need OPTIONS enabled and CORS set up.<\/p>\n<h4>Q3. How do I fix Azure Error 405 in APIM?<\/h4>\n<p><strong>Ans.<\/strong> Define the method as an operation in APIM, and (for missing ops) use a policy to return 405 instead of the default 404 (see code above).<\/p>\n<h4>Q4. How do I fix Error 405 in Azure Function Apps?<\/h4>\n<p><strong>Ans.<\/strong> Add the method (e.g., &#8220;delete&#8221;, &#8220;put&#8221;, &#8220;options&#8221;) in function.json (lowercase!) and redeploy.<\/p>\n<h4>Q5. Can routing or web.config issues cause Azure 405 errors?<\/h4>\n<p><strong>Ans.<\/strong> Yes, conflicting handlers, legacy modules (WebDAV), or missing OPTIONS handlers can cause 405. It suggested to always check web.config and controller routing.<\/p>\n<p><strong>Source Link: <\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Azure Error 405 is a common and confusing issue that developers encounter when calling APIs in Azure. It occurs when&hellip; <a class=\"more-link\" href=\"https:\/\/www.hostingseekers.com\/blog\/azure-error-405-fix\/\">Continue reading <span class=\"screen-reader-text\">Azure Error 405 When Accessing API? Here\u2019s How to Fix It Fast<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":37623,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[7083],"tags":[],"class_list":["post-37613","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-error","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Azure Error 405 When Accessing API? Here\u2019s How to Fix It Fast<\/title>\n<meta name=\"description\" content=\"Fix Azure Error 405 Method Not Allowed fast. Learn common causes, step-by-step solutions for Azure Functions &amp; APIM and troubleshooting table.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.hostingseekers.com\/blog\/azure-error-405-fix\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Azure Error 405 When Accessing API? Here\u2019s How to Fix It Fast\" \/>\n<meta property=\"og:description\" content=\"Fix Azure Error 405 Method Not Allowed fast. Learn common causes, step-by-step solutions for Azure Functions &amp; APIM and troubleshooting table.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.hostingseekers.com\/blog\/azure-error-405-fix\/\" \/>\n<meta property=\"og:site_name\" content=\"Hostingseekers\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/hostingseekers\" \/>\n<meta property=\"article:published_time\" content=\"2025-11-25T11:47:42+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-11-25T12:09:10+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.hostingseekers.com\/blog\/wp-content\/uploads\/2025\/11\/Frame-1321317536.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"675\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"manvinder Singh\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@Hostingseekers1\" \/>\n<meta name=\"twitter:site\" content=\"@Hostingseekers1\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"manvinder Singh\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 minutes\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Azure Error 405 When Accessing API? Here\u2019s How to Fix It Fast","description":"Fix Azure Error 405 Method Not Allowed fast. Learn common causes, step-by-step solutions for Azure Functions & APIM and troubleshooting table.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.hostingseekers.com\/blog\/azure-error-405-fix\/","og_locale":"en_US","og_type":"article","og_title":"Azure Error 405 When Accessing API? Here\u2019s How to Fix It Fast","og_description":"Fix Azure Error 405 Method Not Allowed fast. Learn common causes, step-by-step solutions for Azure Functions & APIM and troubleshooting table.","og_url":"https:\/\/www.hostingseekers.com\/blog\/azure-error-405-fix\/","og_site_name":"Hostingseekers","article_publisher":"https:\/\/www.facebook.com\/hostingseekers","article_published_time":"2025-11-25T11:47:42+00:00","article_modified_time":"2025-11-25T12:09:10+00:00","og_image":[{"width":1200,"height":675,"url":"https:\/\/www.hostingseekers.com\/blog\/wp-content\/uploads\/2025\/11\/Frame-1321317536.png","type":"image\/png"}],"author":"manvinder Singh","twitter_card":"summary_large_image","twitter_creator":"@Hostingseekers1","twitter_site":"@Hostingseekers1","twitter_misc":{"Written by":"manvinder Singh","Est. reading time":"7 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.hostingseekers.com\/blog\/azure-error-405-fix\/#article","isPartOf":{"@id":"https:\/\/www.hostingseekers.com\/blog\/azure-error-405-fix\/"},"author":{"name":"manvinder Singh","@id":"https:\/\/www.hostingseekers.com\/blog\/#\/schema\/person\/76bc9258cab3c5bfe0237d3e290b13ea"},"headline":"Azure Error 405 When Accessing API? Here\u2019s How to Fix It Fast","datePublished":"2025-11-25T11:47:42+00:00","dateModified":"2025-11-25T12:09:10+00:00","mainEntityOfPage":{"@id":"https:\/\/www.hostingseekers.com\/blog\/azure-error-405-fix\/"},"wordCount":1597,"commentCount":0,"publisher":{"@id":"https:\/\/www.hostingseekers.com\/blog\/#organization"},"image":{"@id":"https:\/\/www.hostingseekers.com\/blog\/azure-error-405-fix\/#primaryimage"},"thumbnailUrl":"https:\/\/www.hostingseekers.com\/blog\/wp-content\/uploads\/2025\/11\/Frame-1321317536.png","articleSection":["Error"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.hostingseekers.com\/blog\/azure-error-405-fix\/#respond"]}],"copyrightYear":"2025","copyrightHolder":{"@id":"https:\/\/www.hostingseekers.com\/blog\/#organization"}},{"@type":"WebPage","@id":"https:\/\/www.hostingseekers.com\/blog\/azure-error-405-fix\/","url":"https:\/\/www.hostingseekers.com\/blog\/azure-error-405-fix\/","name":"Azure Error 405 When Accessing API? Here\u2019s How to Fix It Fast","isPartOf":{"@id":"https:\/\/www.hostingseekers.com\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.hostingseekers.com\/blog\/azure-error-405-fix\/#primaryimage"},"image":{"@id":"https:\/\/www.hostingseekers.com\/blog\/azure-error-405-fix\/#primaryimage"},"thumbnailUrl":"https:\/\/www.hostingseekers.com\/blog\/wp-content\/uploads\/2025\/11\/Frame-1321317536.png","datePublished":"2025-11-25T11:47:42+00:00","dateModified":"2025-11-25T12:09:10+00:00","description":"Fix Azure Error 405 Method Not Allowed fast. Learn common causes, step-by-step solutions for Azure Functions & APIM and troubleshooting table.","breadcrumb":{"@id":"https:\/\/www.hostingseekers.com\/blog\/azure-error-405-fix\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.hostingseekers.com\/blog\/azure-error-405-fix\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.hostingseekers.com\/blog\/azure-error-405-fix\/#primaryimage","url":"https:\/\/www.hostingseekers.com\/blog\/wp-content\/uploads\/2025\/11\/Frame-1321317536.png","contentUrl":"https:\/\/www.hostingseekers.com\/blog\/wp-content\/uploads\/2025\/11\/Frame-1321317536.png","width":1200,"height":675,"caption":"Azure Error 405"},{"@type":"BreadcrumbList","@id":"https:\/\/www.hostingseekers.com\/blog\/azure-error-405-fix\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.hostingseekers.com\/blog\/"},{"@type":"ListItem","position":2,"name":"Azure Error 405 When Accessing API? Here\u2019s How to Fix It Fast"}]},{"@type":"WebSite","@id":"https:\/\/www.hostingseekers.com\/blog\/#website","url":"https:\/\/www.hostingseekers.com\/blog\/","name":"Hostingseekers","description":"Hostingseekers","publisher":{"@id":"https:\/\/www.hostingseekers.com\/blog\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.hostingseekers.com\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.hostingseekers.com\/blog\/#organization","name":"HostingSeekers Pvt. Ltd.","url":"https:\/\/www.hostingseekers.com\/blog\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.hostingseekers.com\/blog\/#\/schema\/logo\/image\/","url":"https:\/\/www.hostingseekers.com\/blog\/wp-content\/uploads\/2025\/04\/Hosting-Seekers-Logo.png","contentUrl":"https:\/\/www.hostingseekers.com\/blog\/wp-content\/uploads\/2025\/04\/Hosting-Seekers-Logo.png","width":451,"height":520,"caption":"HostingSeekers Pvt. Ltd."},"image":{"@id":"https:\/\/www.hostingseekers.com\/blog\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/hostingseekers","https:\/\/x.com\/Hostingseekers1","https:\/\/www.linkedin.com\/company\/hostingseekers\/","https:\/\/www.instagram.com\/hostingseekers\/"]},{"@type":"Person","@id":"https:\/\/www.hostingseekers.com\/blog\/#\/schema\/person\/76bc9258cab3c5bfe0237d3e290b13ea","name":"manvinder Singh","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/4373df1ab2b4f1e40b27df8913e40d494a7fd38d128e0ac30e9f7406a4f96e91?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/4373df1ab2b4f1e40b27df8913e40d494a7fd38d128e0ac30e9f7406a4f96e91?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/4373df1ab2b4f1e40b27df8913e40d494a7fd38d128e0ac30e9f7406a4f96e91?s=96&d=mm&r=g","caption":"manvinder Singh"},"description":"Manvinder Singh is the Founder and CEO of HostingSeekers, an award-winning go-to-directory for all things hosting. Our team conducts extensive research to filter the top solution providers, enabling visitors to effortlessly pick the one that perfectly suits their needs. We are one of the fastest growing web directories, with 500+ global companies currently listed on our platform.","sameAs":["https:\/\/www.hostingseekers.com","https:\/\/www.linkedin.com\/in\/manvinder-singh\/"],"url":"https:\/\/www.hostingseekers.com\/blog\/author\/seodeveloper\/"}]}},"_links":{"self":[{"href":"https:\/\/www.hostingseekers.com\/blog\/wp-json\/wp\/v2\/posts\/37613","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hostingseekers.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.hostingseekers.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.hostingseekers.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hostingseekers.com\/blog\/wp-json\/wp\/v2\/comments?post=37613"}],"version-history":[{"count":16,"href":"https:\/\/www.hostingseekers.com\/blog\/wp-json\/wp\/v2\/posts\/37613\/revisions"}],"predecessor-version":[{"id":37630,"href":"https:\/\/www.hostingseekers.com\/blog\/wp-json\/wp\/v2\/posts\/37613\/revisions\/37630"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.hostingseekers.com\/blog\/wp-json\/wp\/v2\/media\/37623"}],"wp:attachment":[{"href":"https:\/\/www.hostingseekers.com\/blog\/wp-json\/wp\/v2\/media?parent=37613"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.hostingseekers.com\/blog\/wp-json\/wp\/v2\/categories?post=37613"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hostingseekers.com\/blog\/wp-json\/wp\/v2\/tags?post=37613"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}