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