[GH-1464] Add appendHeader that supports Literals #1781
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This change adds a new `appendHeader` internal method to `RequestTemplate` allowing for already resolved headers to be added to the resolved `RequestTemplate` preventing duplicate expression processing by using another new method `HeaderTemplate.literal` and `HeaderTemplate.appendLiteral` respectively. I chose this route as it isolates the change to be applied only after the original `HeaderTemplate` has been resolved. While it does expose new public `HeaderTemplate` APIs, I feel that is an OK trade off, allowing a new escape-hatch for situations where URI template processing is not acceptable for Header values.
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This change adds a new
appendHeaderinternal method toRequestTemplateallowing for already resolved headers to be added to the resolvedRequestTemplatepreventing duplicate expression processing by using another new methodHeaderTemplate.literalandHeaderTemplate.appendLiteralrespectively.I chose this route as it isolates the change to be applied only after the original
HeaderTemplatehas been resolved. While it does expose new publicHeaderTemplateAPIs, I feel that is an OK trade off, allowing a new escape-hatch for situations where URI template processing is not acceptable for Header values.