Observed Signal · May 22, 2026 · Technical Guide · Source: DEV Community · Impact: 2/5 · Sentiment: Neutral
Fixing Google BigQuery Auth Proxying
A Dev.to technical post (published 2026-05-22) explains a C#-client issue where Google BigQuery authentication/token refresh requests bypass an HTTP proxy even when BigQuery data calls are proxied. The author demonstrates that assigning a proxied GoogleCredential to the BigQueryClientBuilder.GoogleCredential property (instead of setting builder.Credential) routes OAuth token requests through the proxy. The post includes sample C# code showing use of IWebProxy, Google.Apis.Http.HttpClientFactory.ForProxy, GoogleCredential.FromFileAsync and credential.CreateWithHttpClientFactory to construct a BigQueryClient that proxies both data and auth traffic.
Practical developer workaround for BigQuery client authentication behind proxies; useful for engineers operating cloud data workloads but not industry-shifting.
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Key Takeaways & Evidence Grounding
- Dev.to post by Ryan Esteves published on 2026-05-22 documents BigQuery auth proxying behavior.
- Setting BigQueryClientBuilder.Credential = credential does not route authentication/token requests through an HTTP proxy.
- Setting BigQueryClientBuilder.GoogleCredential = credential (where credential is created with a proxied HttpClientFactory) successfully routes OAuth/token calls through the proxy.
- The provided solution uses IWebProxy, HttpClientFactory.ForProxy, GoogleCredential.FromFileAsync and GoogleCredential.CreateWithHttpClientFactory in C# to proxy both data and auth calls.
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