Data format for ————————————————————————————————————————— * * * Response http/1.1 ok server:apache-coyote/1.1 accept-ranges:bytes etag:w/"27-1432777730225" last-modified:thu, 01:48:50 GMT Content-type:text/html content-length:27 date:thu, 07:03:37 gmt * HTTP/1.0 and http/1.1 difference * * Use The Telnet command, which operates each of these two versions of http***, uses http/1.0, and if a response is immediately disconnected * * * using http/1.1, a response is not immediately disconnected after the request of the * HTTP protocol is made up of three parts: ** the first part: Request line ** request Line contains: Request method, request address, HTTP version ** Part II: request header ** similar to Key-value form, a key can correspond to a value, can also correspond to multiple value ** three important request headers *** Referer: An anti-theft chain that gets the address of the current request **** Create two folders my and other **** create two pages respectively MY.HTML  OTHER.HTML&Nbsp; ***** can only be accessed by files within my folder ***** only files within the My folder can be accessed servlet *** User-agent: Gets the information of the currently requested browser *** If-modified-since: Often used in conjunction with the response inside last-modified for querying the local cache ** Part III: Request Body ** data submitted via post user=lisi ** forms are submitted in many ways, with two commonly used get and post ** accept:text/html,image/* , &NB Sp Client identification file types Accept-Charset:ISO-8859-1 , &NB Sp &nbSp Client Character Set Accept-Encoding:gzip , &NB Sp Client Support encoding type Gzip compression format Accept-Language:zh-cn & nbsp , &NB Sp Client language Host:www.itcast.com:80 , &NB Sp Access server address i F-modified-sincE:tue, Jul 18:23:51 gmt (important) Use control cache with last-modified Referer:http://www.itcast.com/index.jsp / (important ) Prevent hotlinking user-agent:mozilla/4.0 (compatible; MSIE 5.5; Windows NT 5.0) Browser type (file download, different browser for different processing) Connection:close/Keep-Alive , &NB Sp After request the connection is closed or remains date:tue 18:23:51 gmt &NBSP ; Request time  &NThe response of the bsp;* HTTP protocol is composed of three parts: ** First part: Response line ** Structure: HTTP version, status code, status code description ** status code: Status of the current response *** Common Status Codes * 200: Success ok * 302: Redirect * 304: Find local cache * 404: Resources not found * 500: Server Internal error (code is wrong) * 503: Server hung up ** Part II: Response header ** similar to KEY value form, a key can have one or more value *** three important response header information * location ** frequently and 3,021 implementations of redirected * code //redirect using status code 302 response.setstatus (302); //Setting header information location to complete the redirect Operation response.setheader ("Location", "/day07/my/my.html"); * refresh ** A timed jump on the page ** Code &nbSp; response.getwriter (). Write ("The page will jump after 3 seconds."); //use Refresh header information to achieve timed jump response.setheader ("Refresh", "3;url=/day07/other/ Other.html "); * last-modified: ** often request inside if-modified-since together use Find local cache * content-disposition: Do File download time *** Disable browser caching * Expires: -1 Cache-Control:no-cache Pragma:no-cache ** Part III: Response Body ** Display content on the page ** redirect and forward differences *** In a request, and made a request ** redirect: For example, find a small article to borrow money 100,000, Xiaowen no money, tell me little warm money, I went to find a little warm, the money to *** Request two times, response two times ** forwarding: For example, find Zhang San borrow money, but Zhang San no money, Zhang San to help me find John Doe borrow money, finally give me *** request, Respond once —————————————————————————————————————————————————————————————————————— springboot build HTTP service, return the HTTP line is ' http/1.1 200 ' instead of ' http/1.1 OK ' from Springboot 1.4.0 or later this issue The version of Tomcat, to be exact, was upgraded. OK in the http/1.1 protocol is enclosed in parentheses. That is, there can be no. The client should be compatible with this way to reduce the Springbot built-in tomcat version number 1, parse Spring boot parent dependency
<parent> <groupId>org.springframework.boot</groupId> <artifactId> Spring-boot-starter-parent</artifactid> <version>1.5.6.RELEASE</version></parent>
This configuration is spring boot parent dependency, with this, the current project is the Spring boot project, Spring-boot-starter-parent is a special starter, it is used to provide the relevant MAVEN default dependency, after using it , the usual package dependencies can be omitted from the version label. For information about which jar packages the spring boot provides, you can view the C:\Users\ user. m2\repository\org\springframework\boot\spring-boot-dependencies\1.5.1. Release\spring-boot-dependencies-1.5.1.release.pom 2, open this pom file, search "Tomcat.version" will find:<tomcat.version> 8.5.16</tomcat.version>① can directly modify the version of the Tomcat you want here ② in the Pom of your own project to add the version, you can directly overwrite the release here. Example: Tomcat version configuration code for POM?<properties> <tomcat.version>8.0.29</tomcat.version></properties> After adding this, Spingboot's default boot version of Tomcat will do what you need. It's basically done here. But sometimes the boot will error: Tomcat boot error code
caused by:java.lang.noclassdeffounderror:org/apache/juli/logging/logfactory at Org.apache.catalina.util.LifecycleBase. <clinit> (lifecyclebase.java:37) at Org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory.getEmbeddedServletContainer (Tomcatembeddedservletcontainerfactory.java:169) at Org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.createEmbeddedServletContainer ( Embeddedwebapplicationcontext.java:164) at Org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh ( Embeddedwebapplicationcontext.java:134) Common frames omitted
Because the tocmat of this time is missing the jar, the MAVEN project adds the following dependency: Android Invoke method the underlying return null C + + direct NULL pointer
Springboot build HTTP service, return HTTP line is ' http/1.1 200 ' no Status Code description client parsing error
