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Index: R

• @related, references to related URLs: CGI Gateway to XML Middleware
• #REQUIRED keyword, XML documents: Document Type Definition
• radio buttons: Radio buttons
• random images, CGI script returning: An Example
• raw_cookie method: Setting Cookies
• RDF (Resource Definition Format)
• • web page information on: CGI Gateway to XML Middleware
• RDF (Resource Definition Format) tag, XML documents: Writing an XML Parser
• read and write access to data files, controlling: File Permissions
• reading, additional materials: Additional Reading
• reading image (binary file) data: binmode
• reading in entire files (slurping): Avoid Slurping
• reading/writing DBM files, MLDBM module and: MLDBM
• read/write permissions, accessing for hash files: DB_File
• realm
• • authorization, specifying for: WWW-Authenticate
  • logins, identifying in: Authorization
  • protected, indicating with 401 status code: Specifying status codes
• recordset: Example
• • constructing: Example
• RedHat Linux, Apache directory structure on: Web Server Configuration
• redirect method (CGI.pm): Controlling HTTP Headers with CGI.pm
• redirection
• • 307 temporary redirect status code: Specifying status codes
  • to absolute URLs: Forwarding to another URL
  • client requests, status codes for: Location
  • cookies, setting in: Testing for Cookies
  • error messages to browser: CGI Gateway to XML Middleware
  • • Trap die
    • Trap die
  • to relative URLs: Forwarding to another URL
  • server status codes for: The Status Line
  • user requests to static HTML page: Forwarding to another URL
• references
• • cited in this tutorial: Works Cited and Further Reading
  • to related URLs: CGI Gateway to XML Middleware
  • strict rules for, using: Sample CGI
  • symbolic, strict vs.: Use strict
• referencing current scriptname in tags: CGI Gateway to XML Middleware
• Referer field: Referer
• • Testing for Cookies
  • CGI script for checking: Restricting Image Hijacking
• regex
• • extracting words greater than or equal to two characters for index: Inverted Index Search
  • searching for query with: Searching One by One, Take Two
• regexp, finding HTML tags with: Inverted Index Search
• registered media types for the web (IANA registry): Content-Type
• registration forms
• • email addresses, collecting from users: Email Addresses
  • example: Validation example
• regular expressions: Embperl handler
• • checking email address against: Validating Syntax
  • eval function, using with: Regex-Based Search Engine
  • JavaScript support for: Validation example
  • matching email addresses: Validating Syntax
  • mod_perl, problems with: mod_perl Considerations
  • performance, improving: Regular Expressions
  • results, reassigning to $filename: File Uploads with CGI.pm
  • search engine based on: Regex-Based Search Engine
  • search requests, running through: Searching One by One
  • XML tags, filtering out bad data in: CGI Gateway to XML Middleware
• relational database management system (RDBMS): Data Persistence
• • CSV formatted data and: DBD::CSV
  • SQL, using with (see SQL)
• relative times: Caching
• relative URLs: Absolute and Relative URLs
• • Use Relative URLs
  • full paths vs. relative paths: Absolute and Relative URLs
  • redirecting to: Forwarding to another URL
• remote processes as servers: Communicating with Other Servers
• removing indentation, HTML here documents: Here Documents
• removing or replacing files, write permission and: Write Permissions
• removing word suffixes automatically: Inverted Index Search
• rename function (Perl): File Uploads with CGI.pm
• replies to email messages, constructing with formail: Autoreply from nobody
• Reply-To field, email messages: Structure of Internet Email
• request line: HTTP Headers
• • The Request Line
• request methods
• • case sensitivity in: The Request Line
  • HEAD: HEAD
  • METHOD attribute, specifying with: The <FORM> Tag
  • options, browsers including in: Sending Data to the Server
  • POST: POST
  • POST and GET
  • • mailing list signup form (example): Sending Data to the Server
  • PUT and DELETE: PUT and DELETE
  • resources not supporting: Specifying status codes
• request/response cycle (HTTP): The Request and Response Cycle
• • content negotiation: Content Negotiation
  • proxies, effect on: Proxies
• requests from clients: Maintaining State
• requests, HTTP: Browser Requests
• • 405 Not Allowed status header: Specifying status codes
  • 408 Request Timed Out status header: Specifying status codes
  • alternatives to CGI for handling: Alternatives to CGI
  • body: The Request and Response Cycle
  • caching
  • • problems with: ETag
    • proxies and: Proxies
  • CGI scripts, specifying for receiving: The <FORM> Tag
  • client, identifying: Identifying Clients
  • cookie header lines: Maintaining State
  • encoding media types for: The <FORM> Tag
  • generating with form submissions: The <FORM> Tag
  • GET (see GET requests)
  • header field lines: Request Header Field Lines
  • media types, listing preferred in headers: Media Type
  • methods (see request methods)
  • server status codes for: The Status Line
  • stateless or nonpersistent: Maintaining State
  • timed out, 408 status code: Specifying status codes
  • unique identifier, passing with: Maintaining State
• reset buttons: Reset buttons
• resources
• • content negotiation: Content Negotiation
  • date and time of last update: Last-Modified
  • dynamic, problems with caching: Caching
  • entity tags for requested: ETag
  • path information: Elements of a URL
  • redirecting client request for: Location
  • web: URLs
• responses, HTTP: Introduction to CGI
• • Server Responses
  • alternatives to CGI for handling: Alternatives to CGI
  • body: The Request and Response Cycle
  • caching
  • • problems with: ETag
    • proxies and: Proxies
  • categories, client capabilities for: Accept
  • headers: Server Headers
  • headers, server generation of: CGI Output
  • response handlers: mod_perl
• restrictions, turning off in strict mode: Use strict
• return addresses (email messages), falsifying: False Identities
• revision control system, tracking changes to applications: Plan for Future Growth
• RFCs, information sources on: RFCs
• root data structure, XML documents: An Introduction to XML
• • Writing an XML Parser
• root directory (server documents), separating from CGI script directory: Configuring by directory
• routing information, email: Structure of Internet Email
• • overriding senders: Command-Line Options
• ROWS attribute: The <TEXTAREA> Tag
• rules for .procmailrc file: Autoreply from nobody

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