Timeout results in unhandled error

[BlackEdder]

When a (post) request results in a timeout I get the following unhandled error:

    %% Unknown error: {timeout,
                   #{stacktrace =>
                         [{httpc,handle_answer,5,
                              [{file,"httpc.erl"},{line,1277}]},
                          {httpc,handle_request,9,
                              [{file,"httpc.erl"},{line,1220}]},
                          {gleam@httpc,dispatch_bits,2,
                              [{file,"src/gleam/httpc.gleam"},{line,168}]},
                          {gleam@httpc,dispatch,2,
                              [{file,"src/gleam/httpc.gleam"},{line,195}]},
                          {efetch,send,1,
                              [{file,"src/efetch.gleam"},{line,201}]},
                          {trailcoder@openstreetmap,search,3,
                              [{file,"src/trailcoder/openstreetmap.gleam"},
                               {line,82}]},
                          {gleam@list,map_loop,3,
                              [{file,"src/gleam/list.gleam"},{line,409}]},
                          {trailcoder_test,simple_test,0,
                              [{file,"test/trailcoder_test.gleam"},
                               {line,80}]}]}}
  undefined
    %% Unknown error: {blame,[1,3]}

[lv37]

This is a bug in httpc (used by efetch for the Erlang target).

Here's some code to easily reproduce a similar error:

import gleam/httpc
import gleam/http/request
import gleam/result

pub fn main() {
  use req <- result.map(request.to("http://localhost:3000")) // local server that instantly closes the connection

  // replacing this with efetch.send(req) will yield the same result
  httpc.send(req)
  // runtime error: Erlang error
  //
  // An error occurred outside of Gleam.
  //
  // erlang:error(UnexpectedHttpcError(SocketClosedRemotely))
}

Server code:

import * as http from 'http';

let server = http.createServer(() => {
  server.closeAllConnections()
});

server.listen(3000);

[lv37]

Please report this issue in httpc's issue tracker.