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This means it might contain formatting issues, incorrect code, conceptual problems, or other severe issues.
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The content of this page is related to the main page [[Web Scraping#OCaml]]
let init_socket addr port = let inet_addr = (Unix.gethostbyname addr).Unix.h_addr_list.(0) in let sockaddr = Unix.ADDR_INET (inet_addr, port) in let suck = Unix.socket Unix.PF_INET Unix.SOCK_STREAM 0 in Unix.connect suck sockaddr; let outchan = Unix.out_channel_of_descr suck in let inchan = Unix.in_channel_of_descr suck in (inchan, outchan) ;; let serialize ~post_data = String.concat "&" (List.map (fun (key, var) -> key ^ "=" ^ var) post_data) ;; type request = GET | HEAD | POST of (string * string) list let submit_request ~address ~port ~kind ~path ~referer ~user_agent = let req_tag, post_data = match kind with | GET -> "GET", None | HEAD -> "HEAD", None | POST data -> "POST", Some data in let request = (Printf.sprintf "%s %s HTTP/1.0\r\n" req_tag path) ^ (Printf.sprintf "Host: %s\r\n" address) ^ (match user_agent with None -> "" | Some ua -> Printf.sprintf "User-Agent: %s\r\n" ua) ^ (match referer with None -> "" | Some referer -> Printf.sprintf "Referer: %s\r\n" referer) ^ (match post_data with None -> "" | Some post_data -> let post_data = serialize ~post_data in "Content-type: application/x-www-form-urlencoded\r\n" ^ "Content-length: "^ string_of_int(String.length post_data) ^"\r\n" ^ "Connection: close\r\n" ^ "\r\n" ^ post_data ) ^ ("\r\n") in let (inchan, outchan) = init_socket address port in output_string outchan request; flush outchan; (inchan, outchan) ;; let strip_cr str = let len = String.length str in let striped = String.create len in let rec aux i j = if i >= len then j else begin if str.[i] <> '\r' then begin striped.[j] <- str.[i]; aux (succ i) (succ j) end else begin aux (succ i) j end end in let nlen = aux 0 0 in (String.sub striped 0 nlen) ;; let cont_of_inchan ?limit ic = let first_line = strip_cr(input_line ic) in let rec get_header acc = try let line = input_line ic in if line = "\r" || line = "" then acc else get_header(strip_cr line::acc) with End_of_file -> acc in let header = get_header  in let buf = Buffer.create 10240 in let tmp = String.make 1024 '\000' in let rec aux lim = let bytes = input ic tmp 0 (min lim 1024) in if bytes > 0 then begin Buffer.add_substring buf tmp 0 bytes; aux (lim - bytes) end in let rec aux_nolim() = let bytes = input ic tmp 0 1024 in if bytes > 0 then begin Buffer.add_substring buf tmp 0 bytes; aux_nolim() end in (try match limit with | Some lim -> aux lim | None -> aux_nolim() with End_of_file -> ()); let page = Buffer.contents buf in (first_line, header, page) ;; let cut_url ~url = let len = String.length url in let (address, len) = if len < 7 then (url, len) else begin let first_7 = String.sub url 0 7 in if first_7 = "http://" then (String.sub url 7 (len - 7), (len - 7)) else (url, len) end in let (address, path) = try let pos = String.index address '/' in (String.sub address 0 pos, String.sub address (pos) (len - pos)) with _ -> (address, "/") in (address, path) ;; let make_request ~url ?(port=80) ?(kind=GET) ?referer ?user_agent () = let (address, path) = cut_url ~url in let (inchan, outchan) = submit_request ~address ~port ~kind ~path ~referer ~user_agent in let cont = cont_of_inchan inchan in close_in inchan; (cont) ;;