I spent some time being confused as to the purpose of the preflight request but I think I’ve got it now. The key insight is that preflight requests are not a security thing. Rather, they’re a not-changing-the-rules thing. Preflight requests have nothing to do with security, and they have no bearing on applications that are … Read more
It’s not possible to read the current headers. You could make another request to the same URL and read its headers, but there is no guarantee that the headers are exactly equal to the current. Use the following JavaScript code to get all the HTTP headers by performing a get request: var req = new … Read more
We fought a similar problem where Chrome was canceling requests to load things within frames or iframes, but only intermittently and it seemed dependent on the computer and/or the speed of the internet connection. This information is a few months out of date, but I built Chromium from scratch, dug through the source to find … Read more
Status 422 seems most appropiate based on the spec. The 422 (Unprocessable Entity) status code means the server understands the content type of the request entity (hence a 415(Unsupported Media Type) status code is inappropriate), and the syntax of the request entity is correct (thus a 400 (Bad Request) status code is inappropriate) but was … Read more
I strongly oppose 404 in favour of 204 or 200 with empty data. Or at least one should use a response entity with the 404. The request was received and properly processed – it did trigger application code on the server, thus one cannot really say that it was a client error and thus the … Read more
Don’t render 404 yourself, there’s no reason to; Rails has this functionality built in already. If you want to show a 404 page, create a render_404 method (or not_found as I called it) in ApplicationController like this: def not_found raise ActionController::RoutingError.new(‘Not Found’) end Rails also handles AbstractController::ActionNotFound, and ActiveRecord::RecordNotFound the same way. This does two … Read more
Using the -X flag with whatever HTTP verb you want: curl -X PUT -d arg=val -d arg2=val2 localhost:8080 This example also uses the -d flag to provide arguments with your PUT request.
Is the ??? free to be defined by the user? Yes. or is it supplied by the HTML? No. HTML has nothing to do with that. Read below. Is it possible for me to define the ??? as abcdefg? Yes. If you want to send the following data to the web server: name = John … Read more
No. The content-type should be whatever it is known to be, if you know it. application/octet-stream is defined as “arbitrary binary data” in RFC 2046, and there’s a definite overlap here of it being appropriate for entities whose sole intended purpose is to be saved to disk, and from that point on be outside of … Read more
Max Number of default simultaneous persistent connections per server/proxy: Firefox 2: 2 Firefox 3+: 6 Opera 9.26: 4 Opera 12: 6 Safari 3: 4 Safari 5: 6 IE 7: 2 IE 8: 6 IE 10: 8 Edge: 6 Chrome: 6 The limit is per-server/proxy, so your wildcard scheme will work. FYI: this is specifically related … Read more