I sent this email to support at travis CI. It's in their standard format: Hi, We are seeing 502 Bad Gateway errors from homebrew.bintray.com. These download errors lead to increased macOS build times, because the homebrew packages install extra dependencies, and build from source. When these errors happen, macOS build times can increase from 7-12 minutes to 23 minutes, depending on the packages that fail to download. When I attempt to download the same URL locally, I do not see an error. - GitHub accounts torproject - Repository names torproject/tor - Explanation of the issue homebrew.bintray.com fails downloads. brew builds from source. macOS builds are 3x slower. - Copy of the error message (if any) ==> Installing asciidoc ==> Downloading https://homebrew.bintray.com/bottles/asciidoc-8.6.10_1.high_sier curl: (22) The requested URL returned error: 502 Bad Gateway Error: Failed to download resource "asciidoc" Download failed: https://homebrew.bintray.com/bottles/asciidoc-8.6.10_1.high_sierra.bottle.tar.gz Warning: Bottle installation failed: building from source. - Link to a specific build showing the issue https://travis-ci.org/torproject/tor/jobs/510766219 https://travis-ci.org/torproject/tor/jobs/510766220 https://travis-ci.org/torproject/tor/jobs/510777052 https://travis-ci.org/torproject/tor/jobs/510777053