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Cookbook httpclient #2402
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Cookbook httpclient #2402
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,53 @@ | ||
--- | ||
packages: | ||
- name: "lwt" | ||
tested_version: "5.7.0" | ||
used_libraries: | ||
- lwt | ||
- lwt.unix | ||
- name: "lwt_ppx" | ||
tested_version: "2.1.0" | ||
used_libraries: | ||
- lwt_ppx | ||
- name: "cohttp" | ||
tested_version: "5.3.1" | ||
used_libraries: | ||
- cohttp | ||
- name: "cohttp-lwt-unix" | ||
tested_version: "5.3.0" | ||
used_libraries: | ||
- cohttp-lwt-unix | ||
discussion: | | ||
- **About `cohttp`:** The `cohttp` provides a client and a server implementation of HTTP(S) | ||
- **Reference:** The `cohttp` package is documented on the [ocaml-cohttp page](https://github.com/mirage/ocaml-cohttp). | ||
--- | ||
|
||
let url = "https://www.ocaml.org" | ||
|
||
(* The `get` function fetch the ressource. The status code is analysed, and if all is ok, return the body of the answer. If not, the reason of the failure *) | ||
|
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let http_get url = | ||
let%lwt (resp,body) = Cohttp_lwt_unix.Client.get | ||
(Uri.of_string url) in | ||
let code = resp | ||
|> Cohttp.Response.status | ||
|> Cohttp.Code.code_of_status in | ||
if Cohttp.Code.is_success code | ||
then | ||
let%lwt b = Cohttp_lwt.Body.to_string body in | ||
Lwt.return (Ok b) | ||
else | ||
Lwt.return (Error (Cohttp.Code.reason_phrase_of_code code)) | ||
|
||
(* Let's call the `http_get` function. *) | ||
let () = | ||
Lwt_main.run @@ | ||
match%lwt http_get url with | ||
| Error str -> | ||
Printf.printf "%s:fail\n" url; | ||
Printf.printf "Error: %s\n" str; | ||
Lwt.return () | ||
| Ok result -> | ||
Printf.printf "%s:succed\n" url; | ||
print_string result; | ||
Lwt.return () |
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