[doc] add consts for string & runtime, call() for http

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Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.00% (target: -1.00%)	:white_check_mark: ∅

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (eba7b44a41bd64bc861d7971aec1215b01ba7feb) | 4594 | 4205 | 91.53% | | | Head commit (87397b350a45c9864acf8ca3266bb5ad120ba42a) | 4594 (+0) | 4205 (+0) | 91.53% (**+0.00%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#96) | 0 | 0 | **∅ (not applicable)** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 88.97%. Comparing base (eba7b44) to head (87397b3).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #96 +/- ## ======================================= Coverage 88.97% 88.97% ======================================= Files 38 38 Lines 4463 4463 ======================================= Hits 3971 3971 Misses 382 382 Partials 110 110 ```

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