mirror of
https://github.com/strongdm/comply
synced 2024-11-25 00:54:54 +00:00
31 lines
1.4 KiB
Markdown
31 lines
1.4 KiB
Markdown
|
# cleanhttp
|
||
|
|
|
||
|
|
Functions for accessing "clean" Go http.Client values
|
||
|
|
|
||
|
|
-------------
|
||
|
|
|
||
|
|
The Go standard library contains a default `http.Client` called
|
||
|
|
`http.DefaultClient`. It is a common idiom in Go code to start with
|
||
|
|
`http.DefaultClient` and tweak it as necessary, and in fact, this is
|
||
|
|
encouraged; from the `http` package documentation:
|
||
|
|
|
||
|
|
> The Client's Transport typically has internal state (cached TCP connections),
|
||
|
|
so Clients should be reused instead of created as needed. Clients are safe for
|
||
|
|
concurrent use by multiple goroutines.
|
||
|
|
|
||
|
|
Unfortunately, this is a shared value, and it is not uncommon for libraries to
|
||
|
|
assume that they are free to modify it at will. With enough dependencies, it
|
||
|
|
can be very easy to encounter strange problems and race conditions due to
|
||
|
|
manipulation of this shared value across libraries and goroutines (clients are
|
||
|
|
safe for concurrent use, but writing values to the client struct itself is not
|
||
|
|
protected).
|
||
|
|
|
||
|
|
Making things worse is the fact that a bare `http.Client` will use a default
|
||
|
|
`http.Transport` called `http.DefaultTransport`, which is another global value
|
||
|
|
that behaves the same way. So it is not simply enough to replace
|
||
|
|
`http.DefaultClient` with `&http.Client{}`.
|
||
|
|
|
||
|
|
This repository provides some simple functions to get a "clean" `http.Client`
|
||
|
|
-- one that uses the same default values as the Go standard library, but
|
||
|
|
returns a client that does not share any state with other clients.
|