Django Basic---Web framework and Django Introduction

Web Framework

 CS Architecture Installing a client on each user's computer requires upgrading the BS schema update fast users only need a browser socket --socket-- TCP API socket equivalent Expressway FTP HTTPFTP --Maintain connection---can always send messages to each other---establish a connection--communication--- disconnect http -- short connection Once a conversation comes back Stateless no hold status no identification (who does not know who) --- for the service side are unfamiliar cookie session authentication Blog Park Socket Server start Service Listener client request own browser socket Client connection /c1>http request:  get post  get/http/1.1 Host:www.hao123.com connection:keep-alive pragma:n  O-cache cache-control:no-cache upgrade-insecure-requests:1 user-agent:mozilla/5.0 (Windows NT 6.1; WOW64) applewebkit/537.36 (khtml, like Gecko) chrome/58.0.3029.110 safari/537.36 accept:text/html,application/xht ml+xml,application/xml;q=0.9,image/webp,*/* ; q=0.8 accept-encoding:gzip, deflate, SDCH, BR accept-language:zh-cn,zh;q=0.8 cookie:flashid=4 4e88b0f2afbf4753cb89ede14id=de0aid=610 header \ r \ n \ \ \ Body Content http Response: Response http/1.1 OK # Protocol and status Connection:keep-alive container:20808 30.hz_hao123_online_3754 Content-encoding:gzip content-security-policy-report-only:default-src htt PS: ' unsafe-inline ' unsafe-eval ' data:; Report-uriHttps://reports.baidu.com/csp-reportContent-type:text/html;charset=utf-8 # Response content Cxy_all: +BACC561462B9208869A2D59F3D961EF1 Date:fri, 02:10:27 GMT lfy:hz01.47815 public-key-pins-report-only:max-age=30 0;pin-sha256= "k87owbwm9uzfyddvdfoxl+8lpnyoub2ptgtn0fv6g2q=";p in-sha256= "iqbnnbeifuhj+8x6x8xlgh01v9ic5/ V3irqlnffc7v4= "; report-uri="https://reports.baidu.com/pkp-report/"Server:apache set-cookie:org=1; Expires=fri, 24-nov-2017 15:59:59 GMT set-cookie:v_pg=s_4%2cs_33%2cs_36 Set-cookie: __bsi=124521525 09627802100_00_100_r_r_322_0303_c02f_y; max-age=3600; domain=www.hao123.com; path=/tracecode:06269793181026478346112410 tracecode:06268277950916247050112410 Vary: Accept-encoding transfer-encoding:chunked http/1.1 OK # Protocol and status header (can Blank line) \ r \ n \ r \ http/1.1 The body content Hello Ok\r\ n\r\n Hello uses the specific URL of the request header to determine the return of different content URL DNS resolution---IP port Web default port is

======================================================================

A complete web framework

1  Socket Service side

2 different  functions are implemented according to different URLs  .

3  Returning content to the client

  Template Render String substitution


Python framework

    Tornada   1+2+3   Third party's service side + third party return content + third party URL logic

    Django   Chatty    third-party server  + self-written return content    + self-   written URL logic

    Flask    Small and beautiful     third party service side + third party return content + self-written URL logic


Web application    Web server       WSGI protocol



About Django

#  Django Installation

    PIP3 Install Django

#  Create a Django project

django-admin.py startproject mydj manage.py-----a tool inside a Django project that can invoke a Django shell and database. settings.py----contains the default settings for the project, including database information, debug flags, and other work variables. urls.py-----responsible for mapping the URL pattern to the application. wsgi.py-----WSGI Protocol Web application Web server WSGI protocol Django does not need to write a socket---URL---the relationship request (return content) page represents the relevant content for all requests1Request.method2Request. POST.Get("Key") Novice Three-piece set: fromdjango.shortcuts Import HttpResponsereturnHttpResponse render (reqeust,demo.html,{{}}) redirect Template language: {% forIinchxx%} {{i}}{% ENDFOR%}{{Variable name}}html file Address dir config static file css picture address configuration comment out SRFV

Django Basic---Web framework and Django Introduction