Join parts of URL in Julia - url

Question

I am looking for the "best" way in the Julia Programming Language to join parts of a URL into a single URL similar to joinurl in Python.
The full functionality of Python's joinurl is not needed. I'd like to achieve that extra frontslashes are added but also excess frontslashes are remove if needed, i.e.
julia_joinurl("http://localhost/","/index.html") == "http://localhost/index.html"
and
julia_joinurl("http://localhost","index.html") == "http://localhost/index.html".
Is there a Julia package that implements such a high-level function? Or how would I implement this otherwise?

Answer 1

I can't find a joinurl function in Python, so I'm guessing you're referring to urllib.parse.urljoin in the Python standard library. There is a function similar to that in the HTTP.jl package. It creates a URI from the components of the URI:
julia> HTTP.URI(scheme="http", host="example.com", path="/index.html")
HTTP.URI("http://example.com/index.html")
However, it's not as forgiving as the Python urljoin function. You have to start the path argument with a / and you cannot end the host argument with a /:
julia> HTTP.URI(scheme="http", host="example.com", path="index.html")
ERROR: ArgumentError: merge(::HTTP.URIs.URI; scheme::String, userinfo::SubString{String},
host::String, port::SubString{String}, path::String, query::SubString{String},
fragment::SubString{String}) requires !(scheme in ["http", "https"]) ||
(isempty(path) || path[1] == '/')
julia> HTTP.URI(scheme="http", host="example.com/", path="/index.html")
ERROR: ArgumentError: merge(::HTTP.URIs.URI; scheme::String, userinfo::SubString{String},
host::String, port::SubString{String}, path::String, query::SubString{String},
fragment::SubString{String}) requires isempty(host) || host[end] != '/'