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cgi explanation reademe layout

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hugogogo
2022-08-02 23:42:45 +02:00
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@@ -78,26 +78,32 @@
[rfc 3875](https://www.rfc-editor.org/rfc/rfc3875) [rfc 3875](https://www.rfc-editor.org/rfc/rfc3875)
[3.1: server responsabilities](https://www.rfc-editor.org/rfc/rfc3875#section-3.1) [3.1: server responsabilities](https://www.rfc-editor.org/rfc/rfc3875#section-3.1)
- The server [...] receives the request from the client - The server [...] receives the request from the client
- selects a CGI script to handle the request - selects a CGI script to handle the request
- converts the client request to a CGI request - converts the client request to a CGI request
- executes the script and converts the CGI response into a response for the client - executes the script and converts the CGI response into a response for the client
[3.3: script uri](https://www.rfc-editor.org/rfc/rfc3875#section-3.3) [3.3: script uri](https://www.rfc-editor.org/rfc/rfc3875#section-3.3)
- the 'Script-URI' [...] MUST have the property that if the client had accessed this URI instead, then the script would have been executed - the 'Script-URI' [...] MUST have the property that if the client had accessed this URI instead, then the script would have been executed
[4: how the server prepare the cgi requests](https://www.rfc-editor.org/rfc/rfc3875#section-4) [4: how the server prepare the cgi requests](https://www.rfc-editor.org/rfc/rfc3875#section-4)
- the cgi receives 2 differents set of informations : - the cgi receives 2 differents set of informations :
- the request meta-variables (in UNIX, by env variables) - the request meta-variables (in UNIX, by env variables)
- and the message-body - and the message-body
[4.1: request meta-variables](https://www.rfc-editor.org/rfc/rfc3875#section-4.1) [4.1: request meta-variables](https://www.rfc-editor.org/rfc/rfc3875#section-4.1)
- a header field that spans multiple lines MUST be merged onto a single line - a header field that spans multiple lines MUST be merged onto a single line
[4.2: request message-body](https://www.rfc-editor.org/rfc/rfc3875#section-4.2) [4.2: request message-body](https://www.rfc-editor.org/rfc/rfc3875#section-4.2)
- unless defined otherwise, the script access request data by reading stdin - unless defined otherwise, the script access request data by reading stdin
[6: how the response from the script is returned to the server](https://www.rfc-editor.org/rfc/rfc3875#section-6) [6: how the response from the script is returned to the server](https://www.rfc-editor.org/rfc/rfc3875#section-6)
- The response comprises 2 parts, separated by a blank line : - The response comprises 2 parts, separated by a blank line :
- a message-header - a message-header
- and a message-body - and a message-body
@@ -105,6 +111,7 @@
- The body may be NULL - The body may be NULL
[6.2: responses types](https://www.rfc-editor.org/rfc/rfc3875#section-6.2) [6.2: responses types](https://www.rfc-editor.org/rfc/rfc3875#section-6.2)
- four types of responses : - four types of responses :
- document response - document response
- local redirect response - local redirect response
@@ -128,6 +135,7 @@
- the server must check the cgi-script output, and modifie it to comply with the protocol version - the server must check the cgi-script output, and modifie it to comply with the protocol version
[6.3: cgi header fields](https://www.rfc-editor.org/rfc/rfc3875#section-6.3) [6.3: cgi header fields](https://www.rfc-editor.org/rfc/rfc3875#section-6.3)
- whitespace is permitted between the ":" and the field-value - whitespace is permitted between the ":" and the field-value
- but not between the field-name and the ":" - but not between the field-name and the ":"
- the CGI script can set three differents fields : - the CGI script can set three differents fields :
@@ -158,11 +166,13 @@
- the server must resolve conflicts between script-header fields and themselves - the server must resolve conflicts between script-header fields and themselves
[6.3: cgi message body](https://www.rfc-editor.org/rfc/rfc3875#section-6.4) [6.3: cgi message body](https://www.rfc-editor.org/rfc/rfc3875#section-6.4)
- the server must read it untill EOF - the server must read it untill EOF
- the server must not modify it, except to convert charset if needed - the server must not modify it, except to convert charset if needed
[7 and 8: usefull informations about implementation and security](https://www.rfc-editor.org/rfc/rfc3875#section-7) [7 and 8: usefull informations about implementation and security](https://www.rfc-editor.org/rfc/rfc3875#section-7)
#### questions :
- le cgi-script doit renvoyer au moins un header suivit d'une ligne vide - le cgi-script doit renvoyer au moins un header suivit d'une ligne vide
- il peut dans certains cas envoyer d'autres headers - il peut dans certains cas envoyer d'autres headers
- le serveur doit verifier qu'il n'y a pas de doublons dans les headers - le serveur doit verifier qu'il n'y a pas de doublons dans les headers