URL parsing with special characters.

[Vivek]

I am trying to parse  a url similar to "ftp://user:pa...@192.168.0.1/path/file%ver3.txt" using `net/url` Parse function but I am getting a error

`parse "ftp://user:pa...@192.168.0.1/path/file%ver3.txt": invalid URL escape "%ve"`

https://play.golang.org/p/HE6zlDeIbyq

The same path parses fine with python(urllib.parse.urlparse and C# URI). 

I appreciate any help on this.

Regards,

Vivek

[Brian Candler]

In a URL, the percent sign should appear as %25  (% marks the start of a hex-encoded character)

https://play.golang.org/p/gMC1tdpJER4

The URL as shown is invalid.

[Ian Lance Taylor]

I *think* you are saying that the u.Path field should use %25 rather
than plain %. But as the documentation says
(https://golang.org/pkg/net/url/#URL) the Path field is the decoded
form. If you simply print the URL, you will see %25. Consider
https://play.golang.org/p/Z0eUYfkm3PR.

If you mean something else, can you explain? Thanks.

Ian

[Kurtis Rader]

On Thu, Apr 30, 2020 at 10:05 AM Vivek <vickyw...@gmail.com> wrote:

I am trying to parse  a url similar to "ftp://user:pa...@192.168.0.1/path/file%ver3.txt" using `net/url` Parse function but I am getting a error

`parse "ftp://user:pa...@192.168.0.1/path/file%ver3.txt": invalid URL escape "%ve"`

That is not a valid URL. The Python urllib.parse module explicitly ignores invalid percent encodings and treats the % in that case as a literal percent-sign. That URL should be written as `.../file%25ver3.txt`; assuming you want a literal percent-sign in the path.

--

Kurtis Rader

Caretaker of the exceptional canines Junior and Hank

[Brian Candler]

On Thursday, 30 April 2020 23:04:01 UTC+1, Ian Lance Taylor wrote:

On Thu, Apr 30, 2020 at 11:09 AM Brian Candler <b.ca...@pobox.com> wrote:
>
> In a URL, the percent sign should appear as %25  (% marks the start of a hex-encoded character)
> https://play.golang.org/p/gMC1tdpJER4
>
> The URL as shown is invalid.

I *think* you are saying that the u.Path field should use %25 rather
than plain %.

No: I'm just saying the library is working correctly, by rejecting the invalid input that the OP gave.

If the input URL is correct to file%25ver3, then the parsed u.Path contains file%ver3 as expected.

[Vivek]

Thanks everyone.

I am using "github.com/jlaffaye/ftp" library which returned unescaped file names when doing directory listing. I constructed the full url by doing 

filePath = "ftp://user:pa...@192.168.0.1/path/" + "file%ver3.txt" and later tried to parse the url with url.Parse function somewhere else in the code which failed.

I am now calling url.Escape on the file names before appending. 

Regards,

Vivek