Hello everyone, in my application im trying to download data from amazon server. Nov 23, 2009 however when i output a content length header, it will load for ages. I dont want cloudfront serving half retrieved files because it couldnt use the contentlength to verify that it had the whole file. Most of my traffic comes from modern browsers, and quite frankly, most of my users are fairly techsavvy. The following are top voted examples for showing how to use. Check below for a comprehensive overview of changes and ios 7. The request object is deepcopied as part of the initialization process.
By setting the request header accept to gzip, we are telling to the server that we want the response to be compressed if possible with the gzip compression scheme. The methods in this protocol provide progress information about the download of a url asset and, when downloading concludes, provide a file url where the downloaded file can be accessed. Nsurlconnection delegate, nsurlconnection data delegate, and nsurlconnection download delegate. In chunked transfer encoding, the data stream is divided into a series of nonoverlapping chunks. Im running out of options here so i will try a plugin to handle. How to programming with gzip how to build software. Nsurlconnection foundation apple developer documentation. The interface for nsurlconnection is sparse, providing only the controls to start and cancel asynchronous loads of a url request.
The new release comes exactly two weeks following the january 20th release of ios 7. A quickish guide to gzipping for ios apps march 15, 2016. I would also like content to be gzipped on the fly by compression and then served nonchunked with an explicit contentlength, for the reason given here in the edit. These examples are extracted from open source projects. In order to receive a gzipencoded response you must do two things. I discovered that this is because ive got gzip turned on and although the file is 20kb on my server what i was putting in the content length the browser sees it as being 4kb due to the gzip. It does provide a limited function in learning the complete size of a resource prior to receiving an entire message. Nsurlrequest foundation apple developer documentation.
Nov 18, 20 apple has just seeded the beta version of ios 7. To summerize, i need to open huges compressed files 4gb so the technique of dan wont work and i want the length number of line of the. The url loading system provides access to resources identified by urls, using standard protocols like s or custom protocols you create. Content length header with gzip enabled php server side. Nsurlsession is comprised of the same pieces as before, with nsurlrequest, nsurlcache, and the like, but replaces nsurlconnection with nsurlsession, nsurlsessionconfiguration, and three subclasses of nsurlsessiontask.
If your webserver doesnt support transparent compression, you can still upload gzipped content and tell the server to send the correct response headers by setting up a. I discovered that this is because ive got gzip turned on and although the file is 20kb on my server what i was putting in the contentlength the browser sees it as being 4kb due to the gzip. Roughly two weeks after its last release, apples has made ios 7. I am trying do download data from web with normall webrequest work on most url, but server send me unexpected response, like this. We use cookies for various purposes including analytics. Changes made to request after this method returns do not affect the request that is used for the loading process. How to download and process gzipd data ios developer. How to optimize your site with gzip compression betterexplained. To use these protocols, you write a class that conforms to them and implement any methods that are appropriate, then provide an instance of that class as the delegate when you create a connection object. One option to reduce the file size and speed up the download of networkbased resources is by enabling gzip compression on both your server and on your client. How to determine the contentlength of a gzipped file in python.
You dont even need to expand the content before you use it because nsurlconnection. Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site. One option to reduce the file size and speed up the download of networkbased resources is by enabling gzip. An nsurlconnection object provides support to perform the loading of a url request. By continuing to use pastebin, you agree to our use of cookies as described in the cookies policy. The beta version is available for the following ios devices. To summerize, i need to open huges compressed files 4gb so the technique of dan wont work and i want the length number of line of the file so the technique of mark adler is not appropriate. The chunks are sent out and received independently of. On relatively static screens, setting the opaque property wont be a big deal. It does that on both windows and ios although it works on windows but not in ios. Remember to replace the class name with the fully qualified name of your own gzip servlet filter class.
What you want is the actual content, exactly as it would be without the content encoding, but to get it faster. In order to activate the gzip servlet filter in your java web application, you need the configuration below. Compression is a simple, effective way to save bandwidth and speed up your site. This site contains user submitted content, comments and opinions and is for informational purposes only. I dont want cloudfront serving half retrieved files because it couldnt use the content length to verify that it had the whole file. Xcode8 beta and nsurlconnection error apple developer forums.
Still, it can be common for the traffic between our apps and our web api to not be gzipped. Contenttype,authorization,xrequestedwith,xcsrftoken,if. I hesitated when recommending gzip compression when speeding up your javascript because of problems in older browsers. Previously, text drawn with ctframedraw did not correctly place lines to account for the paragraphspacing attribute of nsparagraphstyle. The session object computes the contentlength header based on the size of the data.
Im trying to view the progress bar while downloading a file. Loading is performed asynchronously, so your app can remain responsive and handle incoming data or errors as they arrive. In addition to the methods described in this protocol, an nsurlconnection delegate should also implement the methods described in the nsurlconnection delegate. To use these protocols, you write a class that conforms to them and implement any methods that are appropriate, then provide an instance of that class as the delegate when you create a. If its not supported by the server then the response will be sent as plain text. Messages no longer indicates a send failure immediately after sending. Like nsurlconnection, nsurlsession refers to a group of interdependent classes, in addition to the eponymous class nsurlsession. Jan 20, 2014 the compatibility behavior applies only if the contentlength value exactly matches the expanded gzipd content. Feb 04, 2014 roughly two weeks after its last release, apples has made ios 7. How to determine the content length of a gzipped file in python. Sep 08, 2015 i would also like content to be gzipped on the fly by compression and then served nonchunked with an explicit content length, for the reason given here in the edit.
Despite being undocumented or i just overlooked the hint, nsurlconnection does gzip decompression transparently. The file is generated through php, im sending the contentlength header, which actually works. This is an ideal way to compress the size of html pages. Mar 15, 2016 a quickish guide to gzipping for ios apps march 15, 2016. A compatibility behavior has been added to address an issue where some web servers would send the wrong contentlength value for contentencoding. Contentdisposition, an opportunity to raise a file download. Unity is setting content length automatically even when i use chunked transfer where that should not exist. Chunked transfer encoding is a streaming data transfer mechanism available in version 1. However when i output a contentlength header, it will load for ages.
Unity is setting contentlength automatically even when i use chunked transfer where that should not exist. Contentlength, the length of the response body in octets 8bit bytes. For some apps, this isnt a big deal as the payload between the app and the server is quite small, pehaps just a couple kbs of json or xml. Feel free to download the files, put them on your server and tweak the settings. The nsurlconnection class works in tandem with three formal protocols.
Nsurlconnection expectedcontentlength returns 1 stack. And as you can see, request was send without contentlength. What you want is the actual content, exactly as it would be without the contentencoding, but to get it faster. This is especially useful for textbased data, which has a high potential ratio for compression. Learn nsurlsession using swift part 3 upload swift. Post data in objective c using json nsstring jsonrequest. The compatibility behavior applies only if the contentlength value exactly matches the expanded gzipd content. The latest available public version of ios is still ios 7. The nsurlconnection class reference, located on apples developer website has the following description.
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