![]() ![]() To allow b2_upload_file, you will need to add some headers to "allowedHeaders" in your CORS rule, including "authorization", "X-Bz-File-Name", and "X-Bz-Content-Sha1".The upload URLs and upload authTokens that are returned by b2_get_upload_url and b2_get_upload_part_url can be used to upload to any path in the bucket, so be sure you trust the application and users you give them to.Your code is responsible for retrying when uploads don't work immediately.For uploading, this includes calls such as b2_authorize_account, b2_get_upload_url, b2_start_large_file, b2_get_upload_part_url, and b2_finish_large_file. CORS is not supported for most B2 APIs, so you must perform them in your server, not in a web page.You can set up CORS rules to allow b2_upload_file and b2_upload_part calls to be ![]() Origin header matches one of the rule's allowedOrigins and if the operation is in A non-preflight request (GET or POST) matches a rule if the (case-sensitive) and if every value in the Access-Control-Request-Headers is in the One of the rule's allowedOrigins, if the operation is in the rule's allowedOperations, The byte lengths of the UTF-8 representation of each string in corsRuleName,ĪllowedOrigins, allowedOperations, allowedHeaders, and exposeHeaders.)ī2 uses the first rule which matches the request.Ī CORS preflight (OPTIONS) request matches a rule if the origin header matches (A rule's size in bytes is computed by adding up Each rule mustīe less than 1000 bytes long. You may add up to 100 CORS rules to each of your buckets. So far, four operations are supported for the B2 Native API and five for Or updated on an existing bucket using b2_update_bucket.ĬORS rules only affect B2 operations in their "allowedOperations" list.Įvery rule must specify at least one in their allowedOperations. Rules may be set at the time you create the bucket with b2_create_bucket When a CORS preflight or cross-origin download is requested, B2 evaluates Read more in the "CORS on non-public buckets" section below. Note that CORS does not replace normal B2 authorization mechanisms. To your bucket tells B2 which preflight requests to approve. Servers will say "no" to preflight requests. If it's ok to make the cross-origin request. Request, a browser makes a "preflight" request to ask the server With CORS, before making a non-simple cross-origin Similarly, by default, WebGL will only load textures from the same origin.ī2 supports the standard Cross-Origin Resource Sharingī2 customers to share the content of their buckets with web pages hosted To get content from the same origin as the HTML page that included the script. While images can be embeddedįrom any origin, by default, Javascript can usually only use XMLHttpRequests Port number (usually 80 or 443 for http and https). Web browsers group pages by their 'origin', which is the combination of their protocol ![]() I'm hopeful the authors of the CORS spec will try to address this in the future.Web browsers generally limit a web page's access to content from other sites.ī2 supports Cross-Origin Resource Sharing (CORS) to allow users to lift those There's very little you can do to limit preflights over the course of a long running app. In all honesty, because of the browser's preflight cache limit of 10/120 minutes, and REST's resource urls, the preflight cache is of limited value. At the extreme end, you could use a protocol like JSON-RPC, where all requests are made to a single endpoint. ![]() Custom headers always trigger preflights, so if you have any custom headers, you could move them into query parameters. One is to use a Content-Type that doesn't need a preflight, like 'text/plain'. If you are willing to bend just how "RESTful" your API is, there are a few more things you can try. If your API returns JSON, note that a Content-Type of 'application/json' also triggers a preflight. On GET/POST, avoid custom headers if at all possible, since these still trigger preflights. So updates/deletes to your API will require at least one preflight every 10 minutes. Next note that it is impossible to avoid a preflight on PUT/DELETE requests. So while you should always set the Access-Control-Max-Age header. (I'm not sure if this is true for other browsers). First note that WebKit-based browsers set a max preflight cache lifetime of 10 minutes:Īnd Blink-based browsers limit the cache to two hours: There are a few things to consider if you'd like to limit the number of preflight requests. I brought the same question up on the mailing list, and there were security concerns. Preflight can only be applied to the request, not to the entire domain. ![]()
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