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fix(amp): filter context-1m beta header for local OAuth providers

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Amp CLI sends 'context-1m-2025-08-07' in Anthropic-Beta header which
requires a special 1M context window subscription. After upstream rebase
to v6.3.7 (commit 38cfbac), CLIProxyAPI now respects client-provided
Anthropic-Beta headers instead of always using defaults.

When users configure local OAuth providers (Claude, etc), requests bypass
the ampcode.com proxy and use their own API subscriptions. These personal
subscriptions typically don't include the 1M context beta feature, causing
'long context beta not available' errors.

Changes:
- Add filterBetaFeatures() helper to strip specific beta features
- Filter context-1m-2025-08-07 in fallback handler when using local providers
- Preserve full headers when proxying to ampcode.com (paid users get all features)
- Add 7 test cases covering all edge cases

This fix is isolated to the Amp module and only affects the local provider
path. Users proxying through ampcode.com are unaffected and receive full
1M context support as part of their paid service.
This commit is contained in:
Ben Vargas
2025-11-03 09:22:00 -07:00
parent 8193392bfe
commit 72d82268e5
3 changed files with 91 additions and 0 deletions
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61
internal/api/modules/amp/proxy_test.go
View File

@@ -437,3 +437,64 @@ func TestIsStreamingResponse(t *testing.T) {
})
}
}
func TestFilterBetaFeatures(t *testing.T) {
tests := []struct {
name string
header string
featureToRemove string
expected string
}{
{
name: "Remove context-1m from middle",
header: "fine-grained-tool-streaming-2025-05-14,context-1m-2025-08-07,oauth-2025-04-20",
featureToRemove: "context-1m-2025-08-07",
expected: "fine-grained-tool-streaming-2025-05-14,oauth-2025-04-20",
},
{
name: "Remove context-1m from start",
header: "context-1m-2025-08-07,fine-grained-tool-streaming-2025-05-14",
featureToRemove: "context-1m-2025-08-07",
expected: "fine-grained-tool-streaming-2025-05-14",
},
{
name: "Remove context-1m from end",
header: "fine-grained-tool-streaming-2025-05-14,context-1m-2025-08-07",
featureToRemove: "context-1m-2025-08-07",
expected: "fine-grained-tool-streaming-2025-05-14",
},
{
name: "Feature not present",
header: "fine-grained-tool-streaming-2025-05-14,oauth-2025-04-20",
featureToRemove: "context-1m-2025-08-07",
expected: "fine-grained-tool-streaming-2025-05-14,oauth-2025-04-20",
},
{
name: "Only feature to remove",
header: "context-1m-2025-08-07",
featureToRemove: "context-1m-2025-08-07",
expected: "",
},
{
name: "Empty header",
header: "",
featureToRemove: "context-1m-2025-08-07",
expected: "",
},
{
name: "Header with spaces",
header: "fine-grained-tool-streaming-2025-05-14, context-1m-2025-08-07 , oauth-2025-04-20",
featureToRemove: "context-1m-2025-08-07",
expected: "fine-grained-tool-streaming-2025-05-14,oauth-2025-04-20",
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
result := filterBetaFeatures(tt.header, tt.featureToRemove)
if result != tt.expected {
t.Errorf("filterBetaFeatures() = %q, want %q", result, tt.expected)
}
})
}
}