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Allow users to set request option headers for Anthropic's LLMs #4785

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Allow users to set request option headers for Anthropic's LLMs #4785

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c9c434d
Allow users to set request option headers for Anthropic's LLMs
FallDownTheSystem Mar 24, 2025
82b07e7
Set anthropic-beta headers directly into this.requestOptions
FallDownTheSystem Mar 26, 2025
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61 changes: 44 additions & 17 deletions core/llm/llms/Anthropic.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -179,30 +179,34 @@ class Anthropic extends BaseLLM {
);

const msgs = this.convertMessages(messages);

// Set anthropic-beta headers directly into this.requestOptions
this.setBetaHeaders(shouldCacheSystemMessage);

// Create the request body
const requestBody = {
...this.convertArgs(options),
messages: msgs,
system: shouldCacheSystemMessage
? [
{
type: "text",
text: this.systemMessage,
cache_control: { type: "ephemeral" },
},
]
: systemMessage,
};

const response = await this.fetch(new URL("messages", this.apiBase), {
method: "POST",
headers: {
"Content-Type": "application/json",
Accept: "application/json",
"anthropic-version": "2023-06-01",
"x-api-key": this.apiKey as string,
...(shouldCacheSystemMessage || this.cacheBehavior?.cacheConversation
? { "anthropic-beta": "prompt-caching-2024-07-31" }
: {}),
"x-api-key": this.apiKey as string
},
body: JSON.stringify({
...this.convertArgs(options),
messages: msgs,
system: shouldCacheSystemMessage
? [
{
type: "text",
text: this.systemMessage,
cache_control: { type: "ephemeral" },
},
]
: systemMessage,
}),
body: JSON.stringify(requestBody),
signal,
});

Expand Down Expand Up @@ -285,6 +289,29 @@ class Anthropic extends BaseLLM {
}
}
}

private setBetaHeaders(shouldCacheSystemMessage: boolean | undefined) {
if (!this.requestOptions) this.requestOptions = {};
if (!this.requestOptions.headers) this.requestOptions.headers = {};

const betaValues = new Set<string>();

const existingBetaHeaders = this.requestOptions.headers["anthropic-beta"];
if (existingBetaHeaders) {
existingBetaHeaders
.split(",")
.map((v) => v.trim())
.forEach((v) => betaValues.add(v));
}

if (shouldCacheSystemMessage || this.cacheBehavior?.cacheConversation) {
betaValues.add("prompt-caching-2024-07-31");
}

if (betaValues.size > 0) {
this.requestOptions.headers["anthropic-beta"] = Array.from(betaValues).join(",");
}
}
}

export default Anthropic;
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