HTTP Request Header and HTTP Status Code
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This document provides information about HTTP and HTTPS request headers and status codes. It defines HTTP and HTTPS, describing HTTPS as HTTP plus cryptographic protocols for security. It lists some important HTTP request headers and their descriptions, as well as HTTPS status codes grouped into classes: informational (1xx), successful (2xx), redirects (3xx), client errors (4xx), and server errors (5xx). Each status code class is summarized with example response codes and descriptions.
HTTP Request Header and HTTP Status Code
- 1. HTTPS REQUEST HEADER & HTTPS STATUS CODE Presented By: Abhishek.L.R - 161704 T Manoj - 161781 III Sem M.C.A Aloysius Institute of Management and Information Technology Copyright © 2017
- 2. What is HTTP & HTTPS : • HTTP: Hyper Text Transfer Protocol (HTTP) is a protocol using which hypertext is transferred over the Web. • HTTPS: It’s Similar to HTTP. But cryptographic protocols such as SSL and/or TLS turn http into https i.e. https = http + cryptographic protocols Note : Compared to HTTP , HTTPS does makes the site bit slower since there is a secured handshake is required each time Copyright © 2017
- 3. HTTP v/s HTTPS Copyright © 2017
- 4. HTTPS Request Header : • Request header is used to pass additional information about the request or itself to the server. • Request header can be used by client to pass useful information. • getHeaderNames() and getHeader() methods of javax.servlet.http.HttpServletRequest interface can be used to get the header information. Copyright © 2017
- 5. SomeImportantRequestHeaders Headers Descriptions Accept This specifies the certain media types that are acceptable in the response. Accept-Charset This indicates the character sets that are acceptable in the response. Accept-Encoding This restricts the content-coding values that are acceptable in the response Accept-Language This restricts the set of language that are preferred in the response. Authorization This type indicates that user agent is attempting to authenticate itself with a server. From This type contains internet email address for the user who controls the requesting user agent. Host This type indicates internet host and port number of the resource being requested. If-Modified-Since This type makes GET method condition. Do not return the requested information if it is not modified since the specified date. Range This type request one or more sub-range of the entity, instead of the entire entity. Referrer This type enables client to specify, for the servers benefit, the address(URL) of the resources from which the Request-URL was obtained. User-Agent This type contains information about the user agent originating the request. Copyright © 2017
- 6. HTTPS Status Code : • HTTP response status codes indicate whether a specific HTTP request has been successfully completed or not. • Responses are grouped in five classes: • Informational Responses : 1xx • Successful Responses : 2xx • Redirects Responses : 3xx • Client Errors Responses : 4xx • Servers Errors Responses : 5xx Copyright © 2017
- 7. Informational Responses ( 1XX) • It means the request has been received and the process is continuing. Copyright © 2017 Response Descriptions 100 Continue This interim response indicates that everything so far is OK and that the client should continue with the request or ignore it if it is already finished. 101 Switching Protocol This code is sent in response to an Upgrade request header by the client, and indicates the protocol the server is switching too. 102 Processing (WebDAV) This code indicates that the server has received and is processing the request, but no response is available yet.
- 8. SUCCESSFUL RESPONSES( 2XX) • It means the action was successfully received, understood, and accepted. Response Descriptions 200 OK The request is OK. 201 Created The request is complete, and a new resource is created . 202 Accepted The request is accepted for processing, but the processing is not complete. 203 on authoritative Information The information in the entity header is from a local or third-party copy, not from the original server. 204 No Content A status code and a header are given in the response, but there is no entity-body in the reply. 205 Reset Content The browser should clear the form used for this transaction for additional input. 206 Partial Content The server is returning partial data of the size requested. Used in response to a request specifying a Range header. The server must specify the range included in the response with the Content-Range header. Copyright © 2017
- 9. REDIRECTS RESPONSES ( 3XX) • It means further action must be taken in order to complete the request. Response Descriptions 300 Multiple Choices A link list. The user can select a link and go to that location. Maximum five addresses 301 Moved Permanently The requested page has moved to a new URL. 302 Found The requested page has moved temporarily to a new URL . 303 See Other The requested page can be found under a different URL . 304 Not Modified This is the response code to an If-Modified-Since or If-None-Match header, where the URL has not been modified since the specified date. 305 Use Proxy The requested URL must be accessed through the proxy mentioned in the Location header. 306 Unused This code was used in a previous version. It is no longer used, but the code is reserved. 307 Temporary Redirect The requested page has moved temporarily to a new URL. Copyright © 2017
- 10. Client Error Responses (4XX) • It means the request contains incorrect syntax or cannot be fulfilled. Response Descriptions 400 Bad Request The server did not understand the request. 401 Unauthorized The requested page needs a username and a password. 402 Payment Required You can not use this code yet. 403 Forbidden Access is forbidden to the requested page. 404 Not Found The server can not find the requested page. 405 Method Not Allowed The method specified in the request is not allowed. 406 Not Acceptable The server can only generate a response that is not accepted by the client. 407 Proxy Authentication Required You must authenticate with a proxy server before this request can be served. 408 Request Timeout The request took longer than the server was prepared to wait. Copyright © 2017
- 11. Client Error Responses (4XX) Cont. Response Descriptions 409 Conflict The request could not be completed because of a conflict. 410 Gone The requested page is no longer available . 411 Length Required The "Content-Length" is not defined. The server will not accept the request without it 412 Precondition Failed The pre condition given in the request evaluated to false by the server. 413 Request Entity Too Large The server can not find the requested page. 414 Request-URL Too Long The server will not accept the request, because the URL is too long. Occurs when you convert a "post" request to a "get" request with a long query information . 415 Unsupported Media type The server will not accept the request, because the media type is not supported . 416 Requested Range Not Satisfiable The requested byte range is not available and is out of bounds. 417 Expectation Failed The expectation given in an Expect request-header field could not be met by this server. Copyright © 2017
- 12. Server Error Responses (5XX) : Response Descriptions 500 Internal Server Error The request was not completed. The server met an unexpected condition. 501 Not Implemented The request was not completed. The server did not support the functionality required. 502 Bad Gateway The request was not completed. The server received an invalid response from the upstream server. 503 Service Unavailable The request was not completed. The server is temporarily overloading or down. 504 Gateway Timeout The gateway has timed out. 505 HTTP Version Not Supported The server does not support the "http protocol" version. • It means the server failed to fulfil an apparently valid request. Copyright © 2017
- 13. THANK YOU FOR YOUR ATTENTION ! ANY QUESTION Copyright © 2017
Editor's Notes
- #5: HTTP header fields provide required information about the request or response, or about the object sent in the message body. There are four types of HTTP message headers: General-header: These header fields have general applicability for both request and response messages. Client Request-header: These header fields have applicability only for request messages. Server Response-header: These header fields have applicability only for response messages. Entity-header: These header fields define meta information about the entity-body or, if no body is present, about the resource identified by the request.