Chromium开源工程中的SPDY协议
Chromium内核原理之网络栈
Chromium内核原理之⽹络栈Chromium内核原理之⽹络栈查看⽹络：以前的：chrome://net-internals#sockets现在⽤ chrome://net-export/ 捕获。
⽤chrome://net-export 去看。
效果，⽐如看sockets多少个：参考12019.02.13 13:11:19字数 2,846阅读 1,4131.内核⽹络栈概述2.代码结构3.⽹络请求剖析（专注于HTTP）3.1 URLRequest3.2 URLRequestHttpJob3.3 HttpNetworkTransaction3.4 HttpStreamFactory3.4.1 Proxy解析3.4.2 连接管理3.4.3 Host解析3.4.4 SSL/TLS1.内核⽹络栈概述⽹络堆栈主要是单线程跨平台库，主要⽤于资源获取。
它的主要接⼝是URLRequest和URLRequestContext。
URLRequest，如其名称所⽰，表⽰对URL的请求。
URLRequestContext包含完成URL请求所需的所有关联上下⽂，例如cookie，主机解析器，代理解析器，缓存等。
许多URLRequest对象可以共享相同的URLRequestContext。
尽管磁盘缓存可以使⽤专⽤线程，但是⼤多数⽹络对象都不是线程安全的，并且⼏个组件（主机解析，证书验证等）可能使⽤未连接的⼯作线程。
由于它主要在单个⽹络线程上运⾏，因此不允许阻⽌⽹络线程上的操作。
因此，我们使⽤⾮阻塞操作和异步回调（通常是CompletionCallback）。
⽹络堆栈代码还将⼤多数操作记录到NetLog，这允许消费者在内存中记录所述操作并以⽤户友好的格式呈现它以进⾏调试。
Chromium开发⼈员编写了⽹络堆栈，以便：允许编码到跨平台抽象；提供⽐更⾼级系统⽹络库（例如WinHTTP或WinINET）更⾼的控制能⼒。
** 避免系统库中可能存在的错误；** 为性能优化提供更⼤的机会。
Ch 6 实时数据接口(DDP)
第六章使用因特摩实时数据接口和处理模块(DDP)6.1 因特摩系统的实时数据获取因特摩数据采集和预处理器目前有两种通讯机制：●利用因特网TCP/IP协议的API调用，把实时数据发送给因特摩服务器；●利用OPC（参阅第十章第三节，154页）；●利用微软操作平台的剪切板（Clipboard）技术和实时数据通讯；无论使用那种方法，其目的都是将从其它通道获取的实时数据送往因特摩服务器(INTEMOR Server)。
常用的数据通道可分为以下几类：6.1.1. API方式常用的数据接口通道通过DCS接口获取实时数据通常，在生产过程中，因特摩智能化实时监控和事故预报系统的实时数据源来自底层的计算机分布控制系统（DCS），因此，因特摩系统必须有DCS系统的数据支持。
通过实时数据接口，因特摩系统可以获取多种DCS系统的实时数据。
针对不同的现场计算机分布控制系统（DCS），必须编写或购买相应的DCS数据采集和接口软件，为因特摩系统提供数据支持。
例如，对ProVAX系统而言，在使用因特摩系统时，用户可以考虑使用DCS专业接口CHIP (Computer Highway Interface Program, 计算机高速公路通道接口) 。
通过CHIP，因特摩数据采集和预处理器能够比较方便地和DCS通讯，实时采集数据。
CHIP NT为微软NT版的CHIP，应用较广。
从数据库获取数据用户也可从现场工业数据库中直接获取数据，然后通过调用TCP/IP API接口程序将数据送入因特摩系统。
因特摩系统中使用的数据库有： MS SQL服务器和MS Access数据库。
从其它通道获取数据用户也可从其它通道获取数据送入因特摩。
比如，在因特摩发电厂应用演示系统中，我们使用因特摩仿真器(Simulator)作为数据来源，通过运行“TCP.exe”将数据送入因特摩。
6.1.2. 通过剪贴板(Clipboard)方式获取实时数据任何设备如果能够输出文本格式(Text Format)的数据流到因特摩系统计算机系统的剪贴板(Clipboard)，即可以和因特摩系统连接。
CA Clarity
Studio 内容管理 ........................................................................................................................................................11 Microsoft Project Interface ........................................................................................................................................11 与 VersionOne 集成 ...................................................................................................................................................12 智能部分 .................................................................................................................................................................... 12 Apache Tomcat 日志分析..........................................................................................................................................13
Pycom GPy 1.0 三网络连接微控制器商品说明书
GPYGPy 1.0With WiFi, BLE and cellular LTE-CAT M1/NB1, the GPy is thelatest Pycom triple-bearer MicroPython enabled micro controlleron the market today – the perfect enterprise grade Io T platformfor your connected Things. Create and connect your thingseverywhere, fast.- Espressif ESP32 SoC- Dual processor + WiFi radio System on Chip.- Network processor handles the WiFi connectivity and the IPv6stack- Main processor is entirely free to run the user application- An extra ULP-coprocessor that can monitor GPIOs, the ADCchannels and control most of the internal peripherals duringdeep-sleep mode while only consuming 25uA- Powerful CPU- 1KM Wifi Range- MicroPython enabled- Fits in a standard breadboard (with headers)- Ultra-low power usage: a fraction compared to other connectedmicro controllersGPy FeaturesUse the Pymakr IDESuper easy code editor to write your Python scriptsEasy UploadUpload your scripts, and any other files you want to the GPy viathe FTP serverLocally or remotelyReset the GPy (you can do it locally, or remotely via T elnet)MechanicalProcessingHash / encryptionSHA, MD5, DES, AESWiFi Networking802.11b/g/n 16mbpsBluetoothLow energy and classicRTCRunning at 32KHz- 2 x UART, 2 x SPI, I2C, I2S, micro SD card- Analog channels: 8x12 bit ADCs, 2x8 bit DAC- Timers: 2x64 bit with PWM with up to 16 channels- DMA on all peripherals- Voltage Input: 3.3V - 5.5V- 3v3 output capable of sourcing up to 400mAInterfacesPowerSize: 55mm x 20mm x 3.5mmSecurity & Certifications- SSL/TLS support up to 1.2- WPA Enterprise security- AES encryption engineMemory- RAM: 4MB- Flash Memory: 8MB- GPIO: Up to 22- Hardware floating pointacceleration- Python multi-threading- 34 bands supported from 699Mhz to 2690Mhz (T otal world-wide support)LTE-M Operating Frequencies- One single chip for both CAT M1 and NB1 (yes, only one chip)- 3GPP release 13 LTE Advanced Pro- Supports narrowband LTE UE categories M1/NB1- Integrated baseband, RF, RAM memory and powermanagement- Reduced Tx power class option-Peakpowerestimations:TXcurrent=*****************RXcurrent=*****************- Data rates:- 300 kbps DL- 375 kbps UL (LTE Cat M1 in 1.4 Mhz, HD-FDD)- 40 kbps DL- 55 kbps UL (LTE Cat M2 in 200 kHz, HD-FDD)LTE-M SpecificationReset switch4MB RAMRF switchExternal WiFi andBluetooth antennaconnectorInternal WiFi andBluetooth AntennaWS2812RGB LED3V3 Ultra-Low-Noise switchingregulatorLTE CAT M1 / NB1antenna connectorESP32 Dual CoreMicrocontroller andWiFi/Bluetooth 4.2radio8MB flash memoryLTE CAT M1 / NB1transceiverEU Regulatory ConformanceHereby, Pycom Ltd declares that this device is in compliancewith the essential requirements and other relevant provisions of Directive 1999/5/ECFederal Communication Commission Interference StatementThis device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:(1) This device may not cause harmful interference.(2) This device must accept any interference received, including interference that may cause undesired operation.CAUTION: Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.NOTE: This equipment has been tested and found to complywith the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance withthe instructions, may cause harmful interference to radio communications.However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:- Reorient or relocate the receiving antenna.- Increase the separation between the equipment and receiver.- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.- Consult the dealer or an experienced radio/TV technician for help. RF Warning StatementT o comply with FCC RF exposure compliance requirements, the antennas used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter.This device is intended only for OEM integrators under the following conditions:1) The antenna must be installed such that 20 cm is maintained between the antenna and users, and2) The transmitter module may not be co-located with any other transmitter or antenna.As long as two conditions above are met, further transmittertest will not be required. However, the OEM integrator is still responsible for testing their end-product for any additional compliance requirements required with this module installed. T o ensure compliance with all non-transmitter functions the host manufacturer is responsible for ensuring compliance with the module(s) installed and fully operational. For example, if a host was previously authorized as an unintentional radiator under the Declaration of Conformity procedure without a transmitter certified module and a module is added, the host manufacturer is responsible for ensuring that the after the module is installed and operational the host continues to be compliant with the Part 15B unintentional radiator requirements.The module is limited to OEM installation ONLY.The module is limited to installation in mobile or fixed application. We hereby acknowledge our responsibility to provide guidance to the host manufacturer in the event that they require assistance for ensuring compliance with the Part 15 Subpart B requirements.IMPORTANT NOTE: In the event that these conditions cannotbe met (for example certain laptop configurations or co-location with another transmitter), then the FCC authorization is nolonger considered valid and the FCC ID cannot be used on the final product. In these circumstances, the OEM integrator willbe responsible for reevaluating the end product(including the transmitter) and obtaining a separate FCC authorization.End Product LabelingThis transmitter module is authorized only for use in device where the antenna may be installed such that 20 cm may be maintained between the antenna and users. The final end product must be labeled in a visible area with the following: “Contains FCC ID:2AJMTGPY2R”. The grantee's FCC ID can be used only when all FCC compliance requirements are met.The following FCC part 15.19 statement has to also be available on the label:This device complies with Part 15 of FCC rules. Operation is subject to the following two conditions:(1) this device may not cause harmful interference and(2) this device must accept any interference received, including interference that may cause undesired operation.Manual Information to the End UserThe OEM integrator has to be aware not to provide information to the end user regarding how to install or remove this RF module in the user’s manual of the end product which integrates this module.In the user manual of the end product, the end user has to be informed that the equipment complies with FCC radio-frequency exposure guidelines set forth for an uncontrolled environment.The end user has to also be informed that any changes or modifications not expressly approved by the manufacturer could void the user's authority to operate this equipment.The end user manual shall include all required regulatory information/warning as show in this manual.The maximum operating ambient temperature of the equipment declared by the manufacturer is-20~+85CReceiver category 3GPY。
超文本咖啡壶控制协议
超文本咖啡壶控制协议
简介
HTCPCP的最早出现可以追溯到1998年，由IETF（互联网工程任务组）的一项恶搞行动所提出。
尽管它最初是作为一种幽默的协议出现的，但后来成为了互联网文化的一部分，并引发了一些开发者实际上尝试实现该协议的行为。
协议结构
命令格式
状态码
实际应用
尽管HTCPCP最初是以戏谑的方式提出的，但一些开发者实际上尝试实现了该协议，将其应用于真正的咖啡壶控制设备上。
这些设备通常配备了网络接口，通过HTCPCP协议可以实现通过网络远程控制咖啡壶，或者通过应用程序监控和管理咖啡壶的状态。
HTCPCP也为一些创新的咖啡壶设备提供了思路。
例如，一些咖啡壶通过连接到互联网，可以通过HTCPCP协议接收定制的煮咖啡命令，根据用户的需求定制出特殊口味的咖啡。
此外，HTCPCP的概念也为物联网的发展提供了一种思路。
通过将
智能咖啡壶与其他智能设备连接，可以实现协同工作和自动化控制。
例如，当闹钟响起时，智能咖啡壶可以根据用户设置自动开始煮咖啡，以便用户起床后即可享用新鲜的咖啡。
总结。
Chromium学习小结
URLRequestFileJob -memberName -memberName
1. URLRequest::Start()
URLRequestFtpJob
-memberName -memberName
URLRequest -memberName -memberName
NetworkDelegate -memberName -memberName
URLRequestSimpleJob -memberName -memberName
URLRequestDataJob -memberName -memberName
2. URLRequestJobManager::CreateJob()
URLRequestJob -memberName -memberName
blink::WebFrame
-memberName -memberName
content::RenderFrameImpl
-memberName -memberName
blink::Frame
-memberName -memberName
blink::WebLocalFrame
-memberName -memberName
Chromium中的网络资源申请过程（红色为Blink代码）
Chromium官网上Browser与Render进程之间的通信图
chromium partionalloc 原理-概述说明以及解释
chromium partionalloc 原理-概述说明以及解释1.引言1.1 概述概述部分的内容可以如下所示：引言是一篇文章的开端，它为读者提供了一个整体的背景信息，并简要介绍了文章的主要内容和结构。
在本文中，我们将聚焦于Chromium 的一项重要特性——PartialAlloc的原理。
Chromium是一款开源的浏览器项目，它是Google Chrome浏览器的基础。
PartialAlloc是Chromium中的一个关键技术，它在浏览器的内存管理方面起到了重要的作用。
PartialAlloc是一种内存分配策略，它的设计目标是提高内存的利用率和性能。
传统的内存管理方案往往面临着内外存分离、碎片化等问题，而PartialAlloc通过将大块内存划分为更小的部分，实现了更细粒度的内存管理。
这种方式可以更好地适应不同的内存需求，并减少因分配大块内存而造成的内存浪费。
本文将深入探讨PartialAlloc的原理和实现方式。
我们将介绍它的核心概念和关键算法，并通过示例代码和实验结果来验证其效果。
通过深入理解PartialAlloc的原理，我们可以更好地理解Chromium浏览器的内存管理机制，为优化浏览器性能提供有力的依据和指导。
在下一节中，我们将先对Chromium进行简要介绍，以便读者对Chromium的背景和整体架构有一个初步的了解。
然后，我们将进入到PartialAlloc的具体内容，剖析它的实现原理和设计理念。
请继续阅读下一节，了解更多关于Chromium和PartialAlloc的信息。
文章结构是指文章的组织架构和布局，通过合理的结构可以使读者更好地理解文章内容。
本文将按照以下结构进行展开：1. 引言1.1 概述1.2 文章结构1.3 目的2. 正文2.1 Chromium简介2.2 PartialAlloc原理3. 结论3.1 总结3.2 展望在引言部分，我们会首先对整篇文章进行概述，简要介绍Chromium PartialAlloc的原理，以及文章的目的。
chromium技术指标
Chromium是一个开源的浏览器项目，被广泛应用于许多现代浏览器，如Google Chrome、Microsoft Edge、Opera等。
以下是Chromium的一些技术指标：
1.架构：Chromium采用多进程架构，每个标签页都在独立的进程中运行，以提
高稳定性和安全性。
同时，Chromium也支持插件和扩展。
2.渲染引擎：Chromium使用Blink作为渲染引擎，Blink是WebKit的一个分
支，提供了快速的页面渲染和JavaScript执行能力。
3.网络堆栈：Chromium使用自己的网络堆栈，包括HTTP/2、QUIC等协议
的支持，以提高网络性能和安全性。
4.安全：Chromium采用了一系列的安全措施，如沙箱、隔离等技术，以保护用
户免受恶意网站的攻击。
5.性能：Chromium经过优化，提供了快速的页面加载和JavaScript执行能力。
同时，Chromium也支持各种硬件加速技术，以提高渲染性能。
6.可定制性：由于Chromium是一个开源项目，开发者可以根据自己的需求进行
定制和修改。
这使得基于Chromium的浏览器可以根据不同的需求进行优化和改进。
总之，Chromium是一个强大、安全、快速的浏览器项目，其技术指标在许多方面都领先于其他浏览器。
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The Chromium Projects
Home
Chromium
Chromium OS
Quick links
Report bugs
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Other sites
Chromium Blog
Google Chrome Extensions
Google Chrome Frame Except as otherwise noted, the content of this page is licensed under a Creative Commons Attribution 2.5 license, and examples are licensed under the BSD License.SPDY
SPDY is an experiment with protocols for the web. Its goal is to reduce the latency of web pages.
Documentation
SPDY: An experimental protocol for a faster web
SPDY protocol specification
Server Push and Server Hint
Research
An Argument For Changing TCP Slow Start - Mike Belshe 01/11/10
More Bandwidth Doesn't Matter (much) - Mike Belshe 04/08/10
Standards Work
SSL Next-Protocol-Negotiation Extension - Adam Langley 01/20/10
TLS False Start - Langley, Modadugu, Mueller 06/2010
TLS Snap Start - Adam Langley 06/18/2010
SPDY Proxy Design
SPDY Proxy Examples
SPDY Server and Proxy Authentication
Code
Chromium client
implementation: /viewvc/chrome/trunk/src/net/spdy/
Server tools: /viewvc/chrome/trunk/src/net/tools/flip_server/ Running flip_in_mem_edsm_server
Discuss
/group/spdy-dev
External work
Servers
Jetty Web Server: /Jetty/Feature/SPDY
Apache module for
SPDY: /p/mod-spdy/
Python implementation of a SPDY
server: /mnot/nbhttp/tree/spdy
Ruby SPDY: https:///igrigorik/spdy
node.js SPDY: https:///indutny/node-spdy
Libraries
Netty SPDY (Java library): http://netty.io/blog/2012/02/04/
Ruby wrapper around Chromium SPDY
framer: https:///romanbsd/spdy
Go SPDY: /pkg/http/spdy/
Erlang SPDY: https:///RJ/erlang-spdy
Java
SPDY: /repos/asf/tomcat/trunk/modules/tomcat-lite
C SPDY (libspdy): /index.html (to be used by
libcurl: http://daniel.haxx.se/blog/2011/10/18/libspdy/)
C SPDY (spindly): https:///bagder/spindly
C SPDY (spdylay): https:///tatsuhiro-t/spdylay
iPhone SPDY: https:///sorced-jim/SPDY-for-iPhone
Browsers
Google Chrome
Mozilla Firefox
Tools
Summary of SPDY tools
Chrome page benchmarking tool
搜索此站点
子页面 (10)： Running flip_in_mem_edsm_server Server Push and Server Hints SPDY: An
experimental protocol for a faster web SPDY Best Practices SPDY data SPDY Protocol SPDY Proxy SPDY Proxy Examples SPDY Server and Proxy Authentication SPDY Tools and Debugging 登录|举报滥用行为|打印页面|删除访问权限|由 Google 协作平台强力驱动An_Argument_For_Changing_T …Mike Belshe,
Ċďv.1上午8:51More_Bandwidth_Doesn_t_Matt …Mike Belshe,
Ċďv.1下午3:11effect_of_initial_cwnd_on_plt(1)…Mike Belshe, ďv.1上午9:09评论
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