deepseek-ai/deepseek-harness · error · WebError

WEB_FETCH_TOO_LARGE

WEB_FETCH_TOO_LARGE

Error message

response exceeds the maximum of ${this.limits.maxResponseBytes} bytes

What it means

Error "response exceeds the maximum of ${this.limits.maxResponseBytes} bytes" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/web/web-fetch-http/src/provider.ts:161

      statusCode: response.status,
      body,
      truncated: truncatedByBytes || truncatedByChars,
    }
  }

  /**
   * Read the response stream up to `maxResponseBytes`. A `Content-Length` over
   * the cap rejects immediately with `WEB_FETCH_TOO_LARGE`; a stream that grows
   * past the cap is cut short (`truncatedByBytes`) rather than rejected, so a
   * server that under-reports still yields a bounded usable body.
   */
  private async readCapped(response: Response, signal: AbortSignal): Promise<{ bytes: Uint8Array; truncatedByBytes: boolean }> {
    const declared = response.headers.get('content-length')
    if (declared !== null) {
      const length = Number(declared)
      if (Number.isFinite(length) && length > this.limits.maxResponseBytes) {
        await response.body?.cancel()
        throw new WebError(`response exceeds the maximum of ${this.limits.maxResponseBytes} bytes`, 'WEB_FETCH_TOO_LARGE')
      }
    }

    /* v8 ignore next -- a 2xx Response from fetch always exposes a body stream; the null guard is defensive. */
    if (response.body === null) return { bytes: new Uint8Array(0), truncatedByBytes: false }

    const chunks: Uint8Array[] = []
    let total = 0
    let truncatedByBytes = false
    const reader = response.body.getReader()
    try {
      for (;;) {
        const { done, value } = await reader.read()
        if (done) break
        const remaining = this.limits.maxResponseBytes - total
        // Only DROPPED bytes count as truncation: a chunk that exactly fills the
        // remaining capacity keeps all its bytes and we read on to observe EOF,
        // so an exactly-at-cap body is not falsely flagged truncated.

View on GitHub (pinned to b150a551b8)

Solutions

1. Raise maxResponseBytes in configuration or fetch a smaller resource.

When it happens

Trigger: Thrown at packages/web/web-fetch-http/src/provider.ts:161 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of deepseek-ai/deepseek-harness@b150a551b8 (2026-08-24). Data as JSON: /api/errors/29df77276c02ea1f. Report an issue: GitHub.