espup install fails with 400 Bad Request when querying GitHub API for latest Xtensa Rust version

[adsgodlove]

Hi there,

I'm encountering an issue when trying to install the Espressif Rust ecosystem using espup. The installation fails when querying the GitHub API for the latest Xtensa Rust version, returning a 400 Bad Request error. Here are the details:

Steps to Reproduce

Run the command:

espup install -l debug

Expected Behavior

espup should successfully fetch the latest Xtensa Rust version from the GitHub API and proceed with the installation.

Actual Behavior

The installation fails with the following error:

[warn]: Failed to get latest Xtensa Rust version: HTTP GET Error: GitHub API returned status code: 400 Bad Request
Error: espup::toolchain::http_error

  × HTTP GET Error: GitHub API returned status code: 400 Bad Request

Debug Logs

Relevant debug logs show repeated attempts to connect to the GitHub API:

[debug]: Querying latest Xtensa Rust version from GitHub API
[debug]: Querying GitHub API: 'https://api.github.com/repos/esp-rs/rust-build/releases/latest'
[debug]: starting new connection: https://api.github.com/
[debug]: starting new connection: https://api.github.com/
[debug]: starting new connection: https://api.github.com/
[debug]: starting new connection: https://api.github.com/
[debug]: starting new connection: https://api.github.com/
[debug]: starting new connection: https://api.github.com/

Additional Information

• When I manually query the same GitHub API endpoint using curl, it returns a valid response with the latest release information (v1.88.0.0).
• My environment: macOS (using a MacBook Pro)
• espup version: Not explicitly confirmed, but the latest available via crates.io (as the tool successfully fetches data from crates.io earlier in the process)

Thanks

[SergioGasquez]

A few questions/suggestions:

• You could verify the espup version with espup --version.
• Do you have any proxy environment variable set up (HTTP_PROXY, HTTPS_PROXY, ALL_PROXY`...)
• Can you paste the full debug log?

[JoelDavisEngineering]

A few questions/suggestions:

• You could verify the espup version with espup --version.
• Do you have any proxy environment variable set up (HTTP_PROXY, HTTPS_PROXY, ALL_PROXY`...)
• Can you paste the full debug log?

Hello. I also receive the same error as the OP.

Details

OS: macOS 12.7.6
Machine: Macbook Pro, Intel
espup version: 0.15.1
rustc version: 1.88.0

No proxy environment variable is setup.

Here is the full debug report when running 'espup install -l debug':

[debug]: connecting to crates.io:443 at [2600:9000:2365:c800:c:7ed3:240:93a1]:443
[debug]: No cached session for DnsName("crates.io")
[debug]: Not resuming any session
[debug]: Using ciphersuite TLS13_AES_128_GCM_SHA256
[debug]: Not resuming
[debug]: TLS1.3 encrypted extensions: [ServerNameAck]
[debug]: ALPN protocol is None
[debug]: created stream: Stream(RustlsStream)
[debug]: sending request GET https://crates.io/api/v1/crates/espup/versions
[debug]: writing prelude: GET /api/v1/crates/espup/versions HTTP/1.1
Host: crates.io
User-Agent: ureq/2.12.1
Accept: /
accept-encoding: gzip
[debug]: Chunked body in response
[debug]: response 200 to GET https://crates.io/api/v1/crates/espup/versions
[debug]: dropping stream: Stream(RustlsStream)
[info]: Installing the Espressif Rust ecosystem
[debug]: Querying latest Xtensa Rust version from GitHub API
[debug]: Querying GitHub API: 'https://api.github.com/repos/esp-rs/rust-build/releases/latest'
[debug]: starting new connection: https://api.github.com/
[debug]: starting new connection: https://api.github.com/
[debug]: starting new connection: https://api.github.com/
[debug]: starting new connection: https://api.github.com/
[debug]: starting new connection: https://api.github.com/
[debug]: starting new connection: https://api.github.com/
[warn]: Failed to get latest Xtensa Rust version: HTTP GET Error: GitHub API returned status code: 400 Bad Request
Error: espup::toolchain::http_error

× HTTP GET Error: GitHub API returned status code: 400 Bad Request

[SergioGasquez]

Hi! Sorry for the late reply, mind trying espup install --toolchain-version 1.88.0.0 or espup install --toolchain-version 1.88.0.0 -k ?

[zpeters]

installed espup using cargo install espup --locked

rustc version = rustc 1.90.0 (1159e78c4 2025-09-14)
OS version / info = Darwin Zachs-iMac-6.local 24.6.0 Darwin Kernel Version 24.6.0: Mon Jul 14 11:28:17 PDT 2025; root:xnu-11417.140.69~1/RELEASE_X86_64 x86_64
espup version = espup 0.15.1

please let me know if there is other info i can contribute

(devbox) zachpeters@Zachs-iMac-6 ~/D/alarm_bridge (main)> espup install
[info]: Installing the Espressif Rust ecosystem
[warn]: Failed to get latest Xtensa Rust version: HTTP GET Error: GitHub API returned status code: 400 Bad Request
Error: espup::toolchain::http_error

× HTTP GET Error: GitHub API returned status code: 400 Bad Request

(devbox) zachpeters@Zachs-iMac-6 ~/D/alarm_bridge (main) [1]> espup install --toolchain-version 1.88.0.0
[info]: Installing the Espressif Rust ecosystem
Error: espup::toolchain::http_error

× HTTP GET Error: GitHub API returned status code: 400 Bad Request

(devbox) zachpeters@Zachs-iMac-6 ~/D/alarm_bridge (main) [1]> espup install --toolchain-version 1.88.0.0 -k
[info]: Installing the Espressif Rust ecosystem
[info]: Checking Rust installation
[info]: Installing RISC-V Rust targets ('riscv32imc-unknown-none-elf', 'riscv32imac-unknown-none-elf' and 'riscv32imafc-unknown-none-elf') for 'stable' toolchain
[info]: Installing Xtensa Rust 1.88.0.0 toolchain
[info]: Installing Xtensa LLVM
[info]: Installing GCC (xtensa-esp-elf)
[warn]: Installation for 'LLVM' failed, retrying. Error: HTTP GET Error: 400 Bad Request
[warn]: Installation for 'GCC (xtensa-esp-elf)' failed, retrying. Error: HTTP GET Error: 400 Bad Request
[warn]: Installation for 'Xtensa Rust' failed, retrying. Error: HTTP GET Error: 400 Bad Request
[warn]: Previous installation of LLVM exists in: '/Users/zachpeters/Projects/alarm_bridge/.devbox/virtenv/rustup/toolchains/esp/xtensa-esp32-elf-clang/esp-19.1.2_20250225'. Reusing this installation
[info]: Creating symlink between '/Users/zachpeters/Projects/alarm_bridge/.devbox/virtenv/rustup/toolchains/esp/xtensa-esp32-elf-clang/esp-19.1.2_20250225/esp-clang/lib' and '/Users/zachpeters/.espup/esp-clang'
[info]: Installing GCC (xtensa-esp-elf)
[warn]: Previous installation of GCC exists in: '/Users/zachpeters/Projects/alarm_bridge/.devbox/virtenv/rustup/toolchains/esp/xtensa-esp-elf/esp-14.2.0_20240906'. Reusing this installation
[warn]: Failed to detect version of Xtensa Rust, reinstalling it
[info]: Uninstalling Xtensa Rust toolchain
[info]: Installing Xtensa Rust 1.88.0.0 toolchain
[warn]: Installation for 'Xtensa Rust' failed, retrying. Error: HTTP GET Error: 400 Bad Request
[warn]: Failed to detect version of Xtensa Rust, reinstalling it
[info]: Uninstalling Xtensa Rust toolchain
[info]: Installing Xtensa Rust 1.88.0.0 toolchain
[warn]: Installation for 'Xtensa Rust' failed, retrying. Error: HTTP GET Error: 400 Bad Request
[warn]: Failed to detect version of Xtensa Rust, reinstalling it
[info]: Uninstalling Xtensa Rust toolchain
[info]: Installing Xtensa Rust 1.88.0.0 toolchain
[warn]: Installation for 'Xtensa Rust' failed, retrying. Error: HTTP GET Error: 400 Bad Request

thread 'tokio-runtime-worker' panicked at /private/tmp/nix-build-espup-0.15.1.drv-0/source/src/toolchain/mod.rs:344:32:
called Result::unwrap() on an Err value: SendError { .. }
note: run with RUST_BACKTRACE=1 environment variable to display a backtrace
Error: espup::toolchain::http_error

× HTTP GET Error: 400 Bad Request

[SergioGasquez]

Do you have a GITHUB_TOKEN environment variable, or are you setting a gh token somehow? Also, are you setting any proxy (HTTP_PROXY, HTTPS_PROXY, ALL_PROXY`...) ?

[zpeters]

In my case, i do not have any PROXY or GH_* envs being set. One thing i did discover though. The install is being done in a devbox (https://www.jetify.com/devbox) shell. If is exit the shell and do espup install in my native environment it installs fine

Is there some sort of logging or verbosity i can enable? id like to run both environments and see if its truly trying to hit a different url or what is going on.

Thanks!

[SergioGasquez]

Is there some sort of logging or verbosity i can enable? id like to run both environments and see if its truly trying to hit a different url or what is going on.

You can add -l debug to see debug logs

[zpeters]

I dont know how much this is going to help at this point but this is what i've got. I haven't looked at the code yet to see how the parsing for the version is dong. Looks like we are retrying it a few times.

good install

[debug]: connecting to crates.io:443 at 13.225.143.17:443
[debug]: No cached session for DnsName("crates.io")
[debug]: Not resuming any session
[debug]: Using ciphersuite TLS13_AES_128_GCM_SHA256
[debug]: Not resuming
[debug]: TLS1.3 encrypted extensions: [ServerNameAck]
[debug]: ALPN protocol is None
[debug]: created stream: Stream(RustlsStream)
[debug]: sending request GET https://crates.io/api/v1/crates/espup/versions
[debug]: writing prelude: GET /api/v1/crates/espup/versions HTTP/1.1
Host: crates.io
User-Agent: ureq/2.12.1
Accept: */*
accept-encoding: gzip
[debug]: Chunked body in response
[debug]: response 200 to GET https://crates.io/api/v1/crates/espup/versions
[debug]: dropping stream: Stream(RustlsStream)
[info]: Installing the Espressif Rust ecosystem
[debug]: Querying latest Xtensa Rust version from GitHub API
[debug]: Querying GitHub API: 'https://api.github.com/repos/esp-rs/rust-build/releases/latest'
[debug]: starting new connection: https://api.github.com/
[debug]: Parsing Xtensa Rust version: 1.89.0.0
[debug]: Querying GitHub API: 'https://api.github.com/repos/esp-rs/rust-build/releases?page=1&per_page=100'
[debug]: starting new connection: https://api.github.com/
[debug]: Latest Xtensa Rust version: 1.89.0.0

bad install

[debug]: connecting to crates.io:443 at 13.225.143.50:443
[debug]: No cached session for DnsName("crates.io")
[debug]: Not resuming any session
[debug]: Using ciphersuite TLS13_AES_128_GCM_SHA256
[debug]: Not resuming
[debug]: TLS1.3 encrypted extensions: [ServerNameAck]
[debug]: ALPN protocol is None
[debug]: created stream: Stream(RustlsStream)
[debug]: sending request GET https://crates.io/api/v1/crates/espup/versions
[debug]: writing prelude: GET /api/v1/crates/espup/versions HTTP/1.1
Host: crates.io
User-Agent: ureq/2.12.1
Accept: */*
accept-encoding: gzip
[debug]: Chunked body in response
[debug]: response 200 to GET https://crates.io/api/v1/crates/espup/versions
[debug]: dropping stream: Stream(RustlsStream)
[info]: Installing the Espressif Rust ecosystem
[debug]: Querying latest Xtensa Rust version from GitHub API
[debug]: Querying GitHub API: 'https://api.github.com/repos/esp-rs/rust-build/releases/latest'
[debug]: starting new connection: https://api.github.com/
[debug]: starting new connection: https://api.github.com/
[debug]: starting new connection: https://api.github.com/
[debug]: starting new connection: https://api.github.com/
[debug]: starting new connection: https://api.github.com/
[debug]: starting new connection: https://api.github.com/
[warn]: Failed to get latest Xtensa Rust version: HTTP GET Error: GitHub API returned status code: 400 Bad Request
Error: espup::toolchain::http_error

  × HTTP GET Error: GitHub API returned status code: 400 Bad Request

[zpeters]

this gets stranger... in my devbox environment, if i install espup in the "normal" way (ie from the package manager (nix i think)) the espup install fails

in that same environment if i clone from github and cargo build, then then run espup install from that binary, it succeeds. i even checked out the v0.15.1 tag and tested that, that worked as well.

[SergioGasquez]

if i install espup in the "normal" way (ie from the package manager (nix i think)) the espup install fails

The package manager version may be outdated, we don't maintain any package manager espup package, I would recommend using cargo install, cargo binstall or downloading the artifacts from the GH releases.

[zpeters]

Im convinced! thank you for following through with this @SergioGasquez