我正在尝试从php-Server访问基于python的Google Cloud Endpoints API，而不使用php客户端库（只需发出POST请求，因为我不需要任何授权）。这工作好几周，但现在它不再工作，在服务器日志中我得到以下错误：
<!DOCTYPE html><html lang=en><meta charset=utf-8><meta name=viewport content="initial-scale=1, minimum-scale=1, width=device-width"><title>Error 403 (Forbidden)!!1</title><style>*{margin:0;padding:0}html,code{font:15px/22px arial,sans-serif}html{background:#fff;color:#222;padding:15px}body{margin:7% auto 0;max-width:390px;min-height:180px;padding:30px 0 15px}* > body{background:url(//www.google.com/images/errors/robot.png) 100% 5px no-repeat;padding-right:205px}p{margin:11px 0 22px;overflow:hidden}ins{color:#777;text-decoration:none}a img{border:0}@media screen and (max-width:772px){body{background:none;margin-top:0;max-width:none;padding-right:0}}#logo{background:url(//www.google.com/images/errors/logo_sm_2.png) no-repeat}@media only screen and (min-resolution:192dpi){#logo{background:url(//www.google.com/images/errors/logo_sm_2_hr.png) no-repeat 0% 0%/100% 100%;-moz-border-image:url(//www.google.com/images/errors/logo_sm_2_hr.png) 0}}@media only screen and (-webkit-min-device-pixel-ratio:2){#logo{background:url(//www.google.com/images/errors/logo_sm_2_hr.png) no-repeat;-webkit-background-size:100% 100%}}#logo{display:inline-block;height:55px;width:150px}</style><a href=//www.google.com/><span id=logo aria-label=Google></span></a><p><b>403.</b> <ins>That’s an error.</ins><p>Your client does not have permission to get URL <code>/_ah/spi/API.get_token</code> from this server. (Client IP address: ****:****:*:***::**)<br><br>
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我认为服务器以某种方式被阻止，因为来自JS-Client的请求仍然有效。任何想法，我如何重新激活访问？我更愿意，不要使用API Client Client for PHP。
的问候，
西蒙