Discussion
Custom Mashup with jQuery AJAX request to GitHub is failing
about 6 years ago by Julia
In a custom mashup we make a request to GitHub. These requests have recently started failing. The request failes with the following error:
Request header field Cache-Control is not allowed by Access-Control-Allow-Headers in preflight response.
This appears to be related to the fact that GitHub is setting the following:
Access-Control-Allow-Headers:Authorization, Content-Type, If-Match, If-Modified-Since, If-None-Match, If-Unmodified-Since, Accept-Encoding, X-GitHub-OTP, X-Requested-With
We believe that the following code is causing the issue. Is there a way to disable the prefilter that sets the Cache-Control
header?
)("~/JavaScript/Mashups/Common/HDRegistration/mashup.config.js");
(function(path) {
try {
var tau = {
mashups: new Mashups()
};
tau.mashups.setPlaceholder("RestUI_Board", null, "/JavaScript/Mashups/Common/header_cache_clear/", path);
/*~/JavaScript/Mashups/Common/header_cache_clear/header_cache_clear.js*/
$.ajaxPrefilter(function(options, originalOptions, jqXHR) {
if (options.url && (options.url.indexOf('viewgallery.tpondemand.net') >= 0 || options.url.indexOf('webident.targetprocess.com') >= 0)) {
return;
}
if (!options.headers) {
options.headers = {};
}
options.headers['Cache-Control'] = 'max-age=0';
});
} catch (e) {
trackFailedMashup(path, e);
}
}