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How to get NSURLSession to return Content-Length(http header) from server. Objective-c, ios

由 荒凉一梦 提交于 2019-12-11 11:42:05
问题 I have spend many hours trying the various ideas found in posts on this question with no success. When I use curl I get the desired header : Content-Length. Here is my latest attempt(found somewhere on SO): - (void) trythis { NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration]; NSURLSession *session = [NSURLSession sessionWithConfiguration:config]; NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:myURL]; request.HTTPMethod = @

How to make Head point to master in git?

由 青春壹個敷衍的年華 提交于 2019-12-10 03:59:44
问题 Please help to make Head point to master in git I tried to git rebase HEAD master and git checkout master Nothing of those helps. Updated: Strange I tried: git symbolic-ref HEAD refs/heads/master then git rev-parse refs/heads/master fc550e5ff2fe49d64ee1d8bf0da09b2b24bf2cd7 and then I got strange warning after the following command git rev-parse HEAD warning: refname 'HEAD' is ambiguous. fc550e5ff2fe49d64ee1d8bf0da09b2b24bf2cd7 New Update: There was HEAD branch in remotes -> origin . After

重读TCP/IP(5)之TCP头部

由 Deadly 提交于 2019-12-09 10:27:28
TCP 概述 前一篇讲述了 IP ，它是一个不可靠的，无连接的，无序的，无流控的，只顾寻找最佳路由进行转发，提供最好的传输，既然 IP 不管这些，是因为这些都由 TCP 来完成， IP 层只需要传送，不管到达，复杂度在于路由选择， TCP 接管了有序，有连接的，可靠的服务，复杂度也就在于如何有序，如何控制流量，使得传输可靠，两个协议侧重面不同，但却又相辅相承， TCP 保证正确的传输， IP 保证最佳路径传输， IP 不保证到达， TCP 保证到达。想要知道 TCP 与 IP 不一样的地方就需要了解它的头部和 IP 有什么区别。 TCP 头部 Source port 源端口和 Destination port 目的端口 ： 占 16 位，告知主机该报文段是来自哪个源端口以及传给哪个上层协议（应用层）目的端口的，进行 TCP 通信，客户端通常使用系统自动选择的临时端口号，而服务器则使用一些知名服务的端口号。 应用程序的端口号和应用程序所在主机的IP地址统称为socket（套接字），IP:XX, 在互联网上socket唯一标识每一个应用程序，源端口+源IP+目的端口+目的IP称为套接字对，一对套接字就是一个连接，一个客户端与服务器之间的连接。 Sequence Number 序列号： 占 32 位，一次 TCP 通信（建立到断开）过程中某一个传输方向上的字节流的每个字节的编号，它保证了

Delete all local changesets and revert to tree

由 家住魔仙堡 提交于 2019-12-09 04:00:25
问题 I'm using Mercurial and I've got into a terrible mess locally, with three heads. I can't push, and I just want to delete all my local changes and commits and start again with totally clean code and a clean history. In other words, I want to end up with (a) exactly the same code locally as exists in the tip of the remote branch and (b) no history of any local commits. I know hg update -C overwrites any local changes. But how do I delete any local commits? To be clear, I have no interest in

How to round values only for display in pandas while retaining original ones in the dataframe?

由 两盒软妹~` 提交于 2019-12-09 03:20:43
问题 I wish to only round values in the dataframe for display purposes, when I use head() or tail() but I want the dataframe to retain the original values. I tried using the round method but it changes the values in the original dataframe. I don't wish to create a separate copy each time for this purpose. Is there any other way than creating a separate copy? Edit : I´m having trouble glancing at values because some columns have e^10 notations. I'd just like to have a look at two to three decimal

How do I limit (or truncate) text file by number of lines?

由 别来无恙 提交于 2019-12-08 23:10:14
问题 I would like to use a terminal/shell to truncate or otherwise limit a text file to a certain number of lines. I have a whole directory of text files, for each of which only the first ~50k lines are useful. How do I delete all lines over 50000? 回答1: In-place truncation To truncate the file in-place with sed, you can do the following: sed -i '50001,$ d' filename -i means in place. d means delete. 50001,$ means the lines from 50001 to the end. You can make a backup of the file by adding an

Detached HEAD Issue in Android Studio

由 微笑、不失礼 提交于 2019-12-08 16:35:22
问题 I am new to Android Studio and have began developing a Navigation Drawer app. After having made a mistake in a commit, I played around with the Version control's "Checkout Revision" and now I can no longer push my project onto Github due to a "Detached HEAD". How can I fix this problem? My app runs perfectly fine in the emulator. Thanks 回答1: you can go to VCS menu then Git, Branches, then in Git Branches dialog click on item below local branches then checkout branches and then accept your

Javascript code inside <BODY> runs *before* <SCRIPT>s in <HEAD> are fully loaded?

由 三世轮回 提交于 2019-12-08 12:56:25
问题 When I use the minified version ( ext-all.js ) everything is fine but when I replace it with ext-all-debug.js (everything else intact), firebug reports all sorts of errors due to undefined values that I know are defined in either Ext or other js files that I load after Ext. After some trial and error, I put console.log() s at the end of few js files and none shows up. I think using ext-all-debug.js somehow causes the js code in <BODY></BODY> to be executed before the scripts in the <HEAD> are

Difference between `script` and `link as=“script”` tags

由 本秂侑毒 提交于 2019-12-08 03:36:21
问题 Additionally to the standard method of loading scripts: <script src="js/script.js"></script> I have seen people do this: <link href="js/script.js" as="script"> Is there any difference? Note: There's a similar What's the difference between using link and script tag to reference JavaScript source? question asking about <link href="~/Scripts/jquery-1.4.1.js" type="text/javascript" /> , which is different. 回答1: If that link tag had rel="preload" (or rel="modulepreload" ) on the it, it would

Difference between `script` and `link as=“script”` tags

由 蓝咒 提交于 2019-12-06 15:32:09
Additionally to the standard method of loading scripts: <script src="js/script.js"></script> I have seen people do this: <link href="js/script.js" as="script"> Is there any difference? Note: There's a similar What's the difference between using link and script tag to reference JavaScript source? question asking about <link href="~/Scripts/jquery-1.4.1.js" type="text/javascript" /> , which is different. If that link tag had rel="preload" (or rel="modulepreload" ) on the it, it would indicate a preload request, which would preload, but not run, the script. Whereas of course, script loads and
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