关键词:浏览器刷新,304 Not Modified ,If-Modified-Since,Cache-Control,Expires 今天在用chrome浏览淘宝页面的时候,发现很多来自淘宝图片HTTP状态码是 304 Not Modified 到百度搜索了一下,明白了 304状态的含义(以下绿色内容来自网络): 304 Not Modified:客户端有缓冲的文件并发出了一个条件性的请求(一般是提供If-Modified-Since头表示客户只想比指定日期更新的文档).服务器告诉客户,原来缓…
含义 200 OK (from cache)直接从缓存中获取的内容并未请求服务器 304 Not Modified 请求服务器并和服务器比较 If-Modified-Since,若文件未改变,服务器返回304 何时触发 200 OK (from cache)用户输入网址回车后触发. 304 Not Modified 用户点击刷新按钮后触发.…
In OpenCv, it only provide the function fitEllipse to fit Ellipse, but doesn't provide function to fit circle, so i read some paper, and write a function to do it. The paper it refer to is "A Few Methods for Fitting Circles to Data". Also when t…
fatal error: file '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.1.sdk/System/Library/Frameworks/UIKit.framework/Headers/UIView.h' has been modified since the precompiled header '/Users/…
修改数据库字段类型,但是由于数据表已经存在数据,无法修改: 显示错误: 写道 ORA-01439: column to be modified must be empty to change datatype 修改方法: alter table web_app_base add tmp_col varchar2(3999);-- 添加临时列 update web_app_base set tmp_col = C_EDR_CTNT ; --将目标字段中数据加入到临时列中 update web_a…
本文转载自 IOS开发xcode报错之has been modified since the precompiled header was built 其实我是升级xcode到4.6.3的时候遇到的一个也是has been modified since the precompiled header was built的问题,看一下 是clean一下就好了 今天做百度地图的时候第一次发现下面错误: 问题:Apple LLVM compiler 3.0 error file "BMKPointAn…
2016-10-20 10:19:46,667 [12] ERROR ClientApp.FormDownload - ErrorSystem.InvalidOperationException: The property 'RowId' is part of the object's key information and cannot be modified. 在 System.Data.Entity.Core.Objects.EntityEntry.VerifyEntityValueIsE…
在协同开发的时候,刚刚从svn下载到本地的代码,出现“fatal error: file 'XX-Prefix.pch' has been modified since the precompiled header was built”的问题,这个其实不是什么问题,解决方案如下: 1.找到 XX-Prefix.pch 文件 注释掉下面的代码: #ifdef __OBJC__ #import <UIKit/UIKit.h> #import <CoreData/CoreData.h>…
转载的文章 很实用 IOS开发xcode报错之has been modified since the precompiled header was built 今天做百度地图的时候第一次发现下面错误: 问题:Apple LLVM compiler 3.0 error file "BMKPointAnnotation.h" has been modified since the precompiled header was built (原因:预编译头的时候文件被修改): 解决方法:1…
As a system administrator or Linux power user, you may have probably come across or even on several occasions, used the versatile Linux Rsync tool, which enables users to expeditiously copy or synchronize files locally and remotely. It is as well a g…
Conditional GETs are a great way to reduce bandwidth, and potentially server-side performance, depending on how the information used to determine conditions is calculated. A well-designed web site may return 304 (Not Modified) responses for the many…
2013-06-20 10:03:32 烧写过程是合众达给出的文档 problem: I'm new to using Code Composer Studio 3.3 and am having a very frustrating problem. Sometimes after editing code in my main c file, when I go to save or rebuild I get the following message: "The document has…
当用foreach遍历Collection时,如果对Collection有Add或者Remove操作时,会发生以下运行时错误: "Collection was modified; enumeration operation may not execute." 如下所示: [c-sharp] view plaincopy List<string> list = new List<string>(); for (int i = 0; i < 10; i++)…
https://gist.github.com/TomTasche/9690186 ndk-gdb of NDK r9d modified to *always* debug the ":remote"-process of your app #!/bin/sh # # Copyright (C) The Android Open Source Project # # Licensed under the Apache License, Version 2.0 (the &qu…
今天在使用foreach循环遍历list集合时,出现Collection was modified; enumeration operation may not execute.这个错误,查了半天才发现是当想要修改list集合时,不能使用foreach,因为foreach是取只读的,在取的时候数据不能变(包括修改,删除,添加等),所以只能用for循环.…
asp.net 更新数据时报错:Database operation expected to affect 1 row(s) but actually affected 0 row(s). Data may have been modified or deleted since entities were loaded 原因:Check your object, does it pass Primary Key Null. This Exception is Generally due thi…
在修改表字段的NUMBER类型的精度或刻度时,你可能会遇到ORA-01440: column to be modified must be empty to decrease precision or scale,下面介绍一下,如何处理这个问题.测试案例如下: SQL> drop table test; Table dropped. SQL>create table test(product_id number, price number(38,1)); …
题目来源:Fibonacci Modified We define a modified Fibonacci sequence using the following definition: Given terms and where , term is computed using the following relation: For example, if term and , term , term , term , and so on. Given three intege…
大家有时候会遇到这个错误 malloc: *** error for object 0x******: incorrect checksum for freed object - object was probably modified after being freed.*** set a breakpoint in malloc_error_break to debug 先看下字面意思 对象0x****** 发生了错误:对一个已经被释放了的对象进行了不正确的校验. 你可能对已经被系统释放过…
free - C++ Reference http://www.cplusplus.com/reference/cstdlib/free/ Data races Only the storage referenced by ptr is modified. No other storage locations are accessed by the call.If the function releases a unit of storage that is reused by a call t…
