我在apache服务器上启用了cors请求。 我尝试使用javascript代码执行GET请求，并且该请求有效。但是，当我尝试POST请求时，我的Chrome浏览器发出了OPTIONS请求，该请求在我的服务器上也被允许，我得到了Status Code: 405 Method Not Allowed。怎么了？
我已经引用了以下内容：https://httpd.apache.org/docs/2.4/mod/mod_headers.html，而且我确定我的.htaccess书写正确：
Header add Access-Control-Allow-Origin "http://(mydomain)"
Header add Access-Control-Allow-Headers "origin, x-requested-with, content-type"
Header add Access-Control-Allow-Methods "PUT, GET, POST, DELETE, OPTIONS"
（删除http://无效）
错误消息：
xhr.js?9456:178 OPTIONS *** 405 (Method Not Allowed)
dispatchXhrRequest @ xhr.js?9456:178
xhrAdapter @ xhr.js?9456:12
dispatchRequest @ dispatchRequest.js?3ad9:59
Promise.then (async)
request @ Axios.js?268b:51
Axios.<computed> @ Axios.js?268b:71
wrap @ bind.js?e00f:9
(anonymous) @ auth.js?b4d8:18
Promise.then (async)
Vue.$auth.login @ auth.js?b4d8:14
doLogin @ Login.vue?03db:26
click @ Login.vue?cede:46
invokeWithErrorHandling @ vue.esm.js?c5de:1863
invoker @ vue.esm.js?c5de:2188
original._wrapper @ vue.esm.js?c5de:7559
:8080/?#/login:1 Access to XMLHttpRequest at '***' from origin '***' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.
createError.js?8774:16 Uncaught (in promise) Error: Network Error
at createError (createError.js?8774:16)
at XMLHttpRequest.handleError (xhr.js?9456:87)
从浏览器访问时返回的内容：
Access-Control-Allow-Headers: origin, x-requested-with, content-type
Access-Control-Allow-Methods: PUT, GET, POST, DELETE, OPTIONS
Access-Control-Allow-Origin: http://***
Cache-Control: private, no-cache="set-cookie"
Connection: Keep-Alive
Content-Encoding: gzip
Content-Type: text/html; charset=UTF-8
Date: Fri, 10 May 2019 09:48:57 GMT
Expires: Fri, 10 May 2019 09:48:58 GMT
Keep-Alive: timeout=2, max=100
Server: Apache/2
Transfer-Encoding: chunked
Vary: Accept-Encoding,User-Agent
X-Powered-By: PHP/5.6.40
GET请求后的响应：
Request URL: ***
Request Method: GET
Status Code: 200 OK
Remote Address: 103.251.89.195:443
Referrer Policy: no-referrer-when-downgrade
Access-Control-Allow-Headers: accept, authorization, content-type, origin, referer, x-csrf-token
Access-Control-Allow-Methods: OPTIONS, PUT, GET, POST, DELETE
Access-Control-Allow-Origin: ***
Cache-Control: private, no-cache="set-cookie"
Connection: Keep-Alive
Content-Encoding: gzip
Content-Type: text/html; charset=UTF-8
Date: Fri, 10 May 2019 10:51:28 GMT
Expires: Fri, 10 May 2019 10:51:28 GMT
Keep-Alive: timeout=2, max=100
Server: Apache/2
Transfer-Encoding: chunked
Vary: Accept-Encoding,User-Agent
X-Powered-By: PHP/5.6.40
Provisional headers are shown
Accept: application/json, text/plain, */*
DNT: 1
Origin: ***
Referer: ***
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.131 Safari/537.36
POST请求标头：
Provisional headers are shown
Access-Control-Request-Headers: content-type
Access-Control-Request-Method: POST
DNT: 1
Origin: ***
Referer: ***
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.131 Safari/537.36
上述POST请求的响应标头：
Allow:
Connection: Keep-Alive
Content-Length: 232
Content-Type: text/html; charset=iso-8859-1
Date: Fri, 10 May 2019 10:57:14 GMT
Keep-Alive: timeout=2, max=99
Server: Apache/2
上述POST请求的错误：
OPTIONS *** (Method Not Allowed)
dispatchXhrRequest @ xhr.js?9456:178
xhrAdapter @ xhr.js?9456:12
dispatchRequest @ dispatchRequest.js?3ad9:59
Promise.then (async)
request @ Axios.js?268b:51
Axios.<computed> @ Axios.js?268b:71
wrap @ bind.js?e00f:9
(anonymous) @ auth.js?b4d8:18
Promise.then (async)
Vue.$auth.login @ auth.js?b4d8:14
doLogin @ Login.vue?03db:26
click @ Login.vue?cede:46
invokeWithErrorHandling @ vue.esm.js?c5de:1863
invoker @ vue.esm.js?c5de:2188
original._wrapper @ vue.esm.js?c5de:7559
:8080/?#/login:1 Access to XMLHttpRequest at '***ucp.php?mode=login' from origin 'http://publish.je.acgmuse.com:8080' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.
createError.js?8774:16 Uncaught (in promise) Error: Network Error
at createError (createError.js?8774:16)
at XMLHttpRequest.handleError (xhr.js?9456:87)