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# Index: L

last date modified
  Last-modified field: 2.4.2.6. Last-Modified
  web page, displaying with SSI: 6.2. Server Side Includes
LAST_MODIFIED variable: 6.2.3. Environment Variables
  in files including other files: 6.2.5. Including Boilerplates
length, HTTP message content: 2.3.2.2. Content-Length
  2.4.2.2. Content-Length
lexical variables
  in Embperl module: 6.4.2.2. Variable scope
  mod_perl, problems with: 17.3.2. mod_perl Considerations
libpng, using with gd: 13.3.1. Installation
libraries, specifying Perl with use statement: 10.4.1.1. Connecting to DBI
libwww-perl (see LWP)
line and point charts combination, creating with GD::Graph::linespoints module: 13.4.2. GD::Graph
line charts
  creating with GD::Graph::lines module: 13.4.2. GD::Graph
  three-dimensional, creating with GD::Graph::lines3d module: 13.4.3. GD::Graph3D
line endings: 3.4.1. Check the Client Browser
  (see also end-of-line characters; newlines)
  CGI scripts, not matching current system: 15.1.3. Line Endings
  differences in operating systems: 3.3.1.1. Outputting documents
  newlines end of line character, binmode and: 3.4.1. Check the Client Browser
links
  appending query strings containing session identifier to: 11.2. Hidden Fields
  HTML documents
    replacing: 11.1. Query Strings and Extra Path Information
    updating another document with: 5.3.1.4. Specifying an alternative target
  symbolic links, security risks with: 1.4.1.1. Configuring by directory
list context, scalar context vs.: 2.4.2.4. Date
lists
  choices for users: 4.2.4. The <SELECT> Tag
  elements: 6.4.3.2. List elements
  empty lists, use of: 15.2.1. Use strict
  printing multiple items in: 5.3.3. Standard HTML Elements
  user input, allowed: 8.2.3. Security Strategies
loads.cgi script, plotting average system loads: 13.3.2. Using GD
local function: 5.3.3. Standard HTML Elements
  17.1.3. Localize Variables with my
local processes as clients: 14.1. Communicating with Other Servers
local variables
  bracket pair enclosing in Embperl: 6.4.2.1. Embperl code blocks
  declarations, strict mode and: 15.2.1. Use strict
localizing variables: 17.1.3. Localize Variables with my
locating perl, Unix system: 15.1.2. The Pound-Bang
Location header: 2.4.2.7. Location
  300-level status responses and: 3.3.1.3. Specifying status codes
  redirect method, using instead of: 5.3.1.5. Redirection
  redirecting requests: 3.3.1.2. Forwarding to another URL
locking files: 6.4.5.1. Embperl handler
  10.1.1. Locking
  15.2.5. File Locking
  flock command, using: 10.1.1.1. flock
  hash files: 10.2.1. DB_File
  manual lock files: 10.1.1.2. Manual lock files
logins
  401 status code responses, asking for: 3.3.1.3. Specifying status codes
  resources, restricting with: 2.4.2.10. WWW-Authenticate
  restricted areas (websites), accessing with: 2.3.2.4. Authorization
loops
  creating with HTML::Template: 6.3.1.1. Loops
  parameters as conditions: 6.3.1.2. Conditionals
lossless data compression: 13.1.1. GIF
lossy compression algorithm, use in JPEG format: 13.1.3. JPEG
lowercase index, creating: 12.3. Inverted Index Search
LWP module: 8.2.5. Trusting the Browser
  14.1.3. LWP
  14.5. CGI Gateway to XML Middleware
LWP::Simple module: 14.1.3. LWP
  14.5. CGI Gateway to XML Middleware
  get subroutine: 14.5. CGI Gateway to XML Middleware
LZW compression algorithm: 13.1.1. GIF

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