Content Formatting

DiagramsFetcherOptions

For fine-grained control over how request/response bodies and headers are formatted in diagram notes, use DiagramsFetcherOptions:

var options = new DiagramsFetcherOptions
{
    PlantUmlServerBaseUrl = "https://plantuml.com/plantuml",
    RequestPreFormattingProcessor = content => content,
    RequestPostFormattingProcessor = content => content,
    ResponsePreFormattingProcessor = content => content,
    ResponsePostFormattingProcessor = content => content,
    ExcludedHeaders = ["Authorization", "X-Api-Key"]
};

Property	Type	Default	Description
PlantUmlServerBaseUrl	string	"https://plantuml.com/plantuml"	Base URL of the PlantUML server.
RequestPreFormattingProcessor	Func<string, string>?	null	Transform raw request body before the library formats it into the PlantUML note.
RequestPostFormattingProcessor	Func<string, string>?	null	Transform the formatted request note after the library has formatted it.
ResponsePreFormattingProcessor	Func<string, string>?	null	Transform raw response body before the library formats it into the PlantUML note.
ResponsePostFormattingProcessor	Func<string, string>?	null	Transform the formatted response note after the library has formatted it.
ExcludedHeaders	IEnumerable<string>	[]	HTTP headers to exclude from diagram notes.
SeparateSetup	bool	false	When true, HTTP calls made before StartAction() are wrapped in a visual "Setup" partition in the diagram. See Diagram Customisation.
HighlightSetup	bool	true	When true (and SeparateSetup is enabled), the setup partition is rendered with a background colour. When false, the partition has no background colour.

Pre- and Post-Formatting Processors

The formatting pipeline for each request/response is:

Raw body → PreFormattingProcessor → Library formatting (JSON pretty-print, header layout) → PostFormattingProcessor → Diagram note

Use cases:

• Pre-processor — Deserialise/transform the body before the library formats it (e.g., decrypt or decompress)
• Post-processor — Redact sensitive data, shorten values, or adjust the final note text

var options = new DiagramsFetcherOptions
{
    // Remove bearer tokens from the formatted output
    ResponsePostFormattingProcessor = note =>
        Regex.Replace(note, @"Bearer [A-Za-z0-9\-._~+/]+=*", "Bearer ***"),

    // Pretty-print XML before library formatting
    RequestPreFormattingProcessor = body =>
    {
        try { return XDocument.Parse(body).ToString(); }
        catch { return body; }
    }
};