Simple http request handler canister in Motoko

dpdp · July 22, 2021, 9:20pm

This example of canister allows you to handle the logic to serve http requests and parsing the path;

ORIGYN-SA/motoko_http_handler/blob/master/src/motoko_http_handler/main.mo#L56

    
      
                  token: StreamingCallbackToken;
              };
          };
          
          
public type HeaderField = (Text, Text);
          
          
private func removeQuery(str: Text): Text {
              return Option.unwrap(Text.split(str, #char '?').next());
          };
          
          
public query func http_request(req: HttpRequest): async (HttpResponse) {
              let path = removeQuery(req.url);
              
              if(path == "/") {
                  return {
                      body = Text.encodeUtf8("root page :" # path);
                      headers = [];
                      status_code = 200;
                      streaming_strategy = null;
                  };
              };

Example:

http://localhost:8000/?canisterId={canisterId}
would return root page :/

http://localhost:8000/metrics?canisterId={canisterId}
would return Metrics page :/metrics

Next step: Streaming strategy to allow clients to have a stream of data (video larger than egress limit)

peterparker · September 28, 2021, 6:41pm

Really cool, thanks for the snippet!

lshoo · September 29, 2021, 2:51am

Interesting!
Thanks!

Topic		Replies	Views
Simplest example of http streaming chunks in Motoko Developers	12	3171	February 15, 2022
Error when making HTTP call in Motoko: Canister http responses were different across replicas, and no consensus was reached Developers	5	446	January 24, 2024
Announcing Motoko Server Motoko	30	1524	November 18, 2023
Http_request url extract pathname, search, params, etc Developers	2	375	November 25, 2021
(Help)Motoko Syntax for http_request serving Jpeg Image Language Support	13	1051	September 26, 2022

Simple http request handler canister in Motoko

Related Topics