expfmt: add NegotiateFormats and NegotiateFormatsIncludingOpenMetrics#931
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Add NegotiateFormats and NegotiateFormatsIncludingOpenMetrics that return all recognised formats from the Accept header in descending preference order, allowing servers that support only a subset of formats to pick the first one they can serve without reimplementing the negotiation loop. Rewrite Negotiate and NegotiateIncludingOpenMetrics to delegate to the new functions. Unify the shared negotiation logic into a private negotiateFormats helper parameterised by an includeOpenMetrics flag, eliminating the code duplication between the two variants. Tests use []string acceptHeaderValues to exercise both comma-separated and multi-header Accept values. The implementation joins multiple Accept header values before parsing to correctly handle both forms. Fixes prometheus#928. Signed-off-by: Aliaksei Dziauho <a.dziauho@sap.com>
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Add NegotiateFormats and NegotiateFormatsIncludingOpenMetrics that return all recognised formats from the Accept header in descending preference order, allowing servers that support only a subset of formats to pick the first one they can serve without reimplementing the negotiation loop.
Rewrite Negotiate and NegotiateIncludingOpenMetrics to delegate to the new functions. Unify the shared negotiation logic into a private negotiateFormats helper parameterised by an includeOpenMetrics flag, eliminating the code duplication between the two variants.
Tests use []string acceptHeaderValues to exercise both comma-separated and multi-header Accept values. The implementation joins multiple Accept header values before parsing to correctly handle both forms.
Fixes #928.