Fix default User-Agent regression #2193
Merged
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The recent HTTP client refactor in 14e25ab introduced a bug in which the global default User-Agent is no longer used for requests. Unless a per-feed User-Agent exists, the Go standard library's default User-Agent is used, which looks something like "Go-http-client/1.1". To fix this, make RequestBuilder.WithUserAgent take an additional argument, the default User-Agent, which will be used if there is no per-feed User-Agent (i.e. it is an empty string).
Fixes #2188
Fixes #2189
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