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tinyhttpd解析

admin 11月 13, 2020 0

http协议

以下皆引用自rfc2616

HTTP communication usually takes place over TCP/IP connections.

HTTP 通讯常通过TCP/IP连接进行

http_URL = “http:” “//“ host [ “:” port ] [ abs_path [ “?” query ]]

http_URL格式，重点在问号

The Method token indicates the method to be performed on the
resource identified by the Request-URI. The method is case-sensitive.

http方法，代码只实现了GET,POST

Method         = "OPTIONS"                ; Section 9.2
               | "GET"                    ; Section 9.3
               | "HEAD"                   ; Section 9.4
               | "POST"                   ; Section 9.5
               | "PUT"                    ; Section 9.6
               | "DELETE"                 ; Section 9.7
               | "TRACE"                  ; Section 9.8
               | "CONNECT"                ; Section 9.9
               | extension-method
extension-method = token

状态码，代码实现了200，400，404，500，501

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Status-Code    =  
          | "100"  ; Section 10.1.1: Continue
          | "101"  ; Section 10.1.2: Switching Protocols
          | "200"  ; Section 10.2.1: OK
          | "201"  ; Section 10.2.2: Created
          | "202"  ; Section 10.2.3: Accepted
          | "203"  ; Section 10.2.4: Non-Authoritative Information
          | "204"  ; Section 10.2.5: No Content
          | "205"  ; Section 10.2.6: Reset Content
          | "206"  ; Section 10.2.7: Partial Content
          | "300"  ; Section 10.3.1: Multiple Choices
          | "301"  ; Section 10.3.2: Moved Permanently
          | "302"  ; Section 10.3.3: Found
          | "303"  ; Section 10.3.4: See Other
          | "304"  ; Section 10.3.5: Not Modified
          | "305"  ; Section 10.3.6: Use Proxy
          | "307"  ; Section 10.3.8: Temporary Redirect
          | "400"  ; Section 10.4.1: Bad Request
          | "401"  ; Section 10.4.2: Unauthorized
          | "402"  ; Section 10.4.3: Payment Required
          | "403"  ; Section 10.4.4: Forbidden
          | "404"  ; Section 10.4.5: Not Found
          | "405"  ; Section 10.4.6: Method Not Allowed
          | "406"  ; Section 10.4.7: Not Acceptable
          | "407"  ; Section 10.4.8: Proxy Authentication Required
          | "408"  ; Section 10.4.9: Request Time-out
          | "409"  ; Section 10.4.10: Conflict
          | "410"  ; Section 10.4.11: Gone
          | "411"  ; Section 10.4.12: Length Required
          | "412"  ; Section 10.4.13: Precondition Failed
          | "413"  ; Section 10.4.14: Request Entity Too Large
          | "414"  ; Section 10.4.15: Request-URI Too Large
          | "415"  ; Section 10.4.16: Unsupported Media Type
          | "416"  ; Section 10.4.17: Requested range not satisfiable
          | "417"  ; Section 10.4.18: Expectation Failed
          | "500"  ; Section 10.5.1: Internal Server Error
          | "501"  ; Section 10.5.2: Not Implemented
          | "502"  ; Section 10.5.3: Bad Gateway
          | "503"  ; Section 10.5.4: Service Unavailable
          | "504"  ; Section 10.5.5: Gateway Time-out
          | "505"  ; Section 10.5.6: HTTP Version not supported
          | extension-code

The Content-Type entity-header field indicates the media type of
the entity-body sent to the recipient or, in the case of the HEAD
method, the media type that would have been sent had the request
been a GET.

Content-Type   = "Content-Type" ":" media-type

Media types are defined in section 3.7. An example of the field is

Content-Type: text/html; charset=ISO-8859-4

tinyhttpd

rfc2616是1999年头发布的，该代码写于1999年底，是一个小型的http服务器。

代码流程

|main—–tcp port—–accept—–pthread_create—–exit
|………………………………^—————-|
|…………………………………………………|
|……………………………………….accept_request
|………………………………………../…………………
|……………………………………… /…………………..
|……………………………………GET………………POST
|………………………………………|…………………….|
|……………………………………….…………………../
|…………………………………………………………./
|……………………………………..cgi == 0 || cgi == 1
|…………………………………………/………………..
|………………………………………../………………….
|……………………………….serve_file…………. execute_cgi

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