final String mimeType = responseData.getMimeType();
        if (logger.isDebugEnabled()) {
            logger.debug("mimeType: {}", mimeType);
        }
        if (mimeType == null) {
            response.contentTypeOctetStream();
            return;
        }
        if (mimeType.startsWith("text/")) {
            final String charset = responseData.getCharSet();

                                    <label for="doc.mimetype" class="col-sm-3 text-sm-right col-form-label">mimetype</label>
                                    <div class="col-sm-9">
                                        <la:errors property="doc.mimetype"/>
                                        <la:text styleId="doc.mimetype" property="doc.mimetype" styleClass="form-control"/>
                                    </div>

        putResultDataBody(dataMap, fessConfig.getIndexFieldAnchor(), StringUtil.EMPTY);
        // mimetype
        putResultDataBody(dataMap, fessConfig.getIndexFieldMimetype(), mimeType);
        if (fileTypeHelper != null) {
            // filetype
            putResultDataBody(dataMap, fessConfig.getIndexFieldFiletype(), fileTypeHelper.get(mimeType));
        }
        // content_length

}

private fun Main.mediaType(): MediaType? {
  val mimeType =
    headers?.let {
      for (header in it) {
        val parts = header.split(':', limit = 2)
        if ("Content-Type".equals(parts[0], ignoreCase = true)) {
          return@let parts[1].trim()
        }
      }
      return@let null
    } ?: "application/x-www-form-urlencoded"

  return mimeType.toMediaTypeOrNull()
}

            final SearchRequestBuilder builder = c.prepareSearch(index);
            callback.accept(builder);
            builder.setFetchSource(new String[] { "parentUrl", "method", "mimeType", "sessionId", "url", "executionTime", "createTime",
                    "contentLength", "lastModified", "ruleId", "httpStatusCode", "status" }, null);
            return builder.execute();
        });

<components namespace="fessCrawler">
	<include path="crawler/container.xml" />
	<include path="crawler/robotstxt.xml" />
	<include path="crawler/contentlength.xml" />
	<include path="crawler/mimetype.xml" />

	<component name="internalHttpClient" class="org.codelibs.fess.crawler.client.http.HcHttpClient"
		instance="prototype">
		<property name="connectionTimeout">15000</property>

	if response != nil {
		w.Write(response)
	}
}

// mimeType represents various MIME type used API responses.
type mimeType string

const (
	// Means no response type.
	mimeNone mimeType = ""
	// Means response type is JSON.
	mimeJSON mimeType = "application/json"
	// Means response type is XML.
	mimeXML mimeType = "application/xml"
)

    Integer getHttpStatusCode();

    void setHttpStatusCode(Integer httpStatusCode);

    String getMethod();

    void setMethod(String method);

    String getMimeType();

    void setMimeType(String mimeType);

    Long getCreateTime();

    void setCreateTime(Long createTime);

    Integer getExecutionTime();

    void setExecutionTime(Integer executionTime);

        // mimetype
        putResultDataBody(dataMap, fessConfig.getIndexFieldMimetype(), mimeType);
        if (fileTypeHelper != null) {
            // filetype
            putResultDataBody(dataMap, fessConfig.getIndexFieldFiletype(), fileTypeHelper.get(mimeType));
        }
        // content_length

            buf.append('\"').append(StringEscapeUtils.escapeJson(obj.toString())).append('\"');
        }
        return buf.toString();
    }

    public void setMimeType(final String mimeType) {
        this.mimeType = mimeType;
    }