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| | %%{
machine kcar_http_common;
#### HTTP PROTOCOL GRAMMAR
# line endings, some sites (notably http://news.ycombinator.com as of
# April 2010) do not send '\r', only '\n', so we need to accomodate them.
CRLF = ("\r")? "\n";
# character types
CTL = (cntrl | 127);
safe = ("$" | "-" | "_" | ".");
extra = ("!" | "*" | "'" | "(" | ")" | ",");
reserved = (";" | "/" | "?" | ":" | "@" | "&" | "=" | "+");
sorta_safe = ("\"" | "<" | ">");
unsafe = (CTL | " " | "#" | "%" | sorta_safe);
national = any -- (alpha | digit | reserved | extra | safe | unsafe);
unreserved = (alpha | digit | safe | extra | national);
escape = ("%" xdigit xdigit);
uchar = (unreserved | escape | sorta_safe);
pchar = (uchar | ":" | "@" | "&" | "=" | "+");
tspecials = ("(" | ")" | "<" | ">" | "@" | "," | ";" | ":" | "\\" | "\"" | "/" | "[" | "]" | "?" | "=" | "{" | "}" | " " | "\t");
lws = (" " | "\t");
# elements
token = (ascii -- (CTL | tspecials));
phrase = (any -- CRLF)+;
Status_Phrase = (digit+ (" "+ phrase)?) >mark %status_phrase ;
http_number = (digit+ "." digit+) ;
HTTP_Version = ("HTTP/" http_number) >mark %http_version ;
Status_Line = HTTP_Version " "+ Status_Phrase :> CRLF;
field_name = ( token -- ":" )+ >start_field %write_field;
field_value = any* >start_value %write_value;
value_cont = lws+ any* >start_value %write_cont_value;
message_header = ((field_name ":" lws* field_value)|value_cont) :> CRLF;
chunk_ext_val = token*;
chunk_ext_name = token*;
chunk_extension = ( ";" " "* chunk_ext_name ("=" chunk_ext_val)? )*;
last_chunk = "0"+ chunk_extension CRLF;
chunk_size = (xdigit* [1-9a-fA-F] xdigit*) $add_to_chunk_size;
chunk_end = CRLF;
chunk_body = any >skip_chunk_data;
chunk_begin = chunk_size chunk_extension CRLF;
chunk = chunk_begin chunk_body chunk_end;
ChunkedBody := chunk* last_chunk @end_chunked_body;
Trailers := (message_header)* CRLF @end_trailers;
FullResponse = Status_Line (message_header)* CRLF @header_done;
main := FullResponse;
}%%
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