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lib/promscrape: send Accept header similar to Prometheus when scraping targets

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This should fix scraping Spring Boot servers, which return incorrect response
unless `Accept: text/plain` request header is set.

See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/608
This commit is contained in:
Aliaksandr Valialkin 2020-07-08 19:47:08 +03:00
parent fd4d593c75
commit 87f8c728bf
1 changed files with 6 additions and 0 deletions
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6
lib/promscrape/client.go
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@ -80,6 +80,12 @@ func (c *client) ReadData(dst []byte) ([]byte, error) {
req := fasthttp.AcquireRequest()
req.SetRequestURI(c.requestURI)
req.SetHost(c.host)
// The following `Accept` header has been copied from Prometheus sources.
// See https://github.com/prometheus/prometheus/blob/f9d21f10ecd2a343a381044f131ea4e46381ce09/scrape/scrape.go#L532 .
// This is needed as a workaround for scraping stupid Java-based servers such as Spring Boot.
// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/608 for details.
// Do not bloat the `Accept` header with OpenMetrics shit, since it looks like dead standard now.
req.Header.Set("Accept", "text/plain;version=0.0.4;q=1,*/*;q=0.1")
if !*disableCompression || c.disableCompression {
req.Header.Set("Accept-Encoding", "gzip")
}