Cargo download dependency failed "send: no filter connected"

[yuyang-ok]

Problem

Cargo download dependency failed

This issue I filed on rust forum before, But I didn't get enough useful information.

---

^{Edited by a maintainer}

The error may look like:

% cargo t -v

**error****:** failed to download from `https://crates.io/api/v1/crates/zstd-sys/2.0.7+zstd.1.5.4/download`

Caused by:

[2] Failed initialization ([CONN-1-0] send: no filter connected)

This is due to a bug in some bad versions of libcurl, whose HTTP/2 multiplexing is not compatible with http proxy settings. The affected versions are:

• 7.87.0
• 7.88.0
• 7.88.1

If you're on macOS and your system libcurl is included, we suggest

• either using Rust version 1.71, beta-2023-06-09, nightly-2023-06-11 or newer
• or disabling http.multiplexing manually in .cargo/config.toml or CARGO_HTTP_MULTIPLEXING=false.

[weihanglo]

Hello. Looks like you're using Rust 1.68.2. Can you try the prerelease stable version to see if the issue persists? We had some significant problems with curl 7.87 and 7.88. In Rust 1.70.0, we bumped curl to 8.0.1.

[yuyang-ok]

@weihanglo Thanks , but the rust toolchain configuration is written via rust-toolchain.toml in a lot open source project .

yuyang@yuyangdeMacBook-Pro deno % cat rust-toolchain.toml 
[toolchain]
channel = "1.68.2"
components = ["rustfmt", "clippy"]

I think it is hard to modify this file.

[weihanglo]

Could you provide a minimal reproducible example for it? I am a bit astray without any actual example 😅. It would also be better if you could share the full version info via cargo -vV. Thank you!

[yuyang-ok]

@weihanglo sure

yuyang@yuyangdeMacBook-Pro wasmtime % cargo -vV 
cargo 1.70.0 (ec8a8a0ca 2023-04-25)
release: 1.70.0
commit-hash: ec8a8a0cabb0e0cadef58902470f6c7ee7868bdc
commit-date: 2023-04-25
host: x86_64-apple-darwin
libgit2: 1.6.3 (sys:0.17.0 vendored)
libcurl: 7.88.1 (sys:0.4.61+curl-8.0.1 system ssl:(SecureTransport) LibreSSL/3.3.6)
os: Mac OS 13.4.0 [64-bit]

[weihanglo]

Sorry I am a bit confused.

• With which version you encountered this issue?
• Have configured Cargo somewhere in your system? Can you share the output from cargo +nightly -Z unstable-options config get? (Note that I might contain sensitive data)
• Also, Could you provide a minimal reproducible example?

[yuyang-ok]

yuyang@yuyangdeMacBook-Pro wasmtime % cargo +nightly -Z unstable-options config get
incremental = true
target.x86_64-apple-darwin.rustflags = ["-C", "link-arg=-fuse-ld=lld"]
# The following environment variables may affect the loaded values.
# CARGO_HOME=/Users/yuyang/.cargo

[yuyang-ok]

Also, Could you provide a minimal reproducible example?

I try to minimal a project to reproduce this, But this problem is gone.

yuyang@yuyangdeMacBook-Pro abc-rust % cargo b 
warning: version requirement `2.0.7+zstd.1.5.4` for dependency `zstd-sys` includes semver metadata which will be ignored, removing the metadata is recommended to avoid confusion
    Finished dev [unoptimized + debuginfo] target(s) in 0.05s
yuyang@yuyangdeMacBook-Pro abc-rust % cat Cargo.toml 
[package]
name = "abc-rust"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
zstd-sys="2.0.7+zstd.1.5.4"

I have a Cargo project works fine past days , I don't know what happened to my toolchain make it not working again.
A little wried to me too.

[yuyang-ok]

This comes from a big open source project , I didn't know how to minimal it.

@weihanglo

[yuyang-ok]

more project have this issue now on my local machine.
I just clone the RustPython project.

yuyang@yuyangdeMacBook-Pro RustPython % cargo check 
error: failed to download from `https://crates.io/api/v1/crates/xml-rs/0.8.4/download`

Caused by:
  [2] Failed initialization ([CONN-1-0] send: no filter connected)

[weihanglo]

Have you ever configured any HTTP Proxies like https_proxy? See #11746. It should already be fixed in the current stable (1.70.0). Could you give in a shot again?
Sorry I was confused since you posted #12202 (comment) saying 1.70.0 is in use.

[yuyang-ok]

yuyang@yuyangdeMacBook-Pro RustPython % cat ~/.cargo/config.toml 

#[http]
#proxy = "127.0.0.1:7890"

#[https]
#proxy = "127.0.0.1:7890"

incremental = true

[target.x86_64-apple-darwin]
rustflags = [
    "-C", "link-arg=-fuse-ld=lld",
]
yuyang@yuyangdeMacBook-Pro RustPython % echo $https_proxy

yuyang@yuyangdeMacBook-Pro RustPython % echo $http_proxy 

yuyang@yuyangdeMacBook-Pro RustPython % 

I think I have not define proxy server.