feat: add default_headers for azure embeddings

[nuernber]

Related Issues

• fixes Support default_headers for AzureOpenAIDocumentEmbedder and AzureOpenAITextEmbedder #8534

Proposed Changes:

Follows the logic from AzureOpenAIGenerator for default_headers:

haystack/haystack/components/generators/azure.py

Line 71 in 852900d

default_headers: Optional[Dict[str, str]] = None,

and

haystack/haystack/components/generators/azure.py

Line 152 in 852900d

default_headers=self.default_headers,

How did you test it?

Ran the unit tests and also tested with my Azure set up that uses a subscription key.

Notes for the reviewer

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.
• I documented my code
• I ran pre-commit hooks and fixed any issue

[CLAassistant]

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[coveralls]

Pull Request Test Coverage Report for Build 12685298781

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

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Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 371 unchanged lines in 35 files lost coverage.
• Overall coverage increased (+0.9%) to 91.026%

---

Files with Coverage Reduction	New Missed Lines	%
components/generators/chat/azure.py	1	92.86%
components/preprocessors/document_cleaner.py	1	98.1%
components/preprocessors/document_splitter.py	1	99.51%
components/retrievers/sentence_window_retriever.py	1	98.08%
components/builders/answer_builder.py	2	96.83%
core/component/component.py	2	98.75%
dataclasses/chat_message.py	2	99.09%
utils/callable_serialization.py	2	95.0%
components/builders/chat_prompt_builder.py	3	95.89%
components/converters/pypdf.py	3	95.95%

Totals
Change from base Build 11781566054:	0.9%
Covered Lines:	8571
Relevant Lines:	9416

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💛 - Coveralls

[Amnah199]

@nuernber thanks for the contribution. Can you please sign the CLA?

[davidsbatista]

@nuernber left a few comments - one question still, is the default_header an optional or mandatory parameter according to the Azureus API?

[Amnah199]

@davidsbatista default_headers is an optional parameter in AzureOpenAI.
https://github.com/openai/openai-python/blob/7cdc6ddbdd3c09e567c5582490aec9d7f99c468e/src/openai/lib/azure.py#L81

[julian-risch]

@nuernber Thank you for contributing to Haystack! Could you please sign the contributor license agreement (CLA), otherwise we cannot merge this PR.
#8535 (comment)

[Amnah199]

@nuernber thanks for the contribution. We created a fresh PR #8699 to add default_headers as a keyword parameter to embedders. This is done to prevent too-many-positional-arguments in future.
Hence, closing this PR.